A studio shot of the Klein Tools 653MQS KNECT metric impact flip socket set organized inside an orange MODbox accessory case with a clear lid, featuring three color-coded quad sockets, two extension shafts, and a drive adapter.
A detailed view of a single black impact-rated quad socket demonstrating the 4-sizes-in-1 design, highlighting the laser-etched 7mm, 8mm, 10mm, and 12mm size markings and color-coded identification rings.
A technical diagram illustrating the quick-access spring-loaded mechanism of the KNECT quad sockets; the top view shows the small socket engaged, while the bottom view shows it compressed to reveal the large socket.
A component breakdown of the 653MQS set, displaying the 12 different metric sizes contained in 3 flip sockets, alongside 3.5-inch and 6.5-inch impact extensions and the multi-purpose KNECT M-system adapter.
A functional demonstration of the impact-rated quad socket attached to a cordless impact driver, showcasing the modular connection and professional-grade durability for high-torque fastening tasks.
A graphic showing the versatility of the multi-purpose KNECT M-system adapter, illustrating how it connects quad sockets or traditional sockets to specialized pass-through wrenches and handles.
Two quad sockets stored together on a single steel extension shaft, emphasizing the space-saving design and organized transport of the metric 7mm through 14mm hex sizes.
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The 653MQS quad socket set case mounted to the side of a larger MODbox rolling tool tower, demonstrating the modular compatibility and accessibility of the system on a busy job site.
How A Quad Socket Works (651QS, 652QS, 653QS, 654QS and 656QS) promotional how to video
A studio shot of the Klein Tools 653MQS KNECT metric impact flip socket set organized inside an orange MODbox accessory case with a clear lid, featuring three color-coded quad sockets, two extension shafts, and a drive adapter.
A detailed view of a single black impact-rated quad socket demonstrating the 4-sizes-in-1 design, highlighting the laser-etched 7mm, 8mm, 10mm, and 12mm size markings and color-coded identification rings.
A technical diagram illustrating the quick-access spring-loaded mechanism of the KNECT quad sockets; the top view shows the small socket engaged, while the bottom view shows it compressed to reveal the large socket.
A component breakdown of the 653MQS set, displaying the 12 different metric sizes contained in 3 flip sockets, alongside 3.5-inch and 6.5-inch impact extensions and the multi-purpose KNECT M-system adapter.
A functional demonstration of the impact-rated quad socket attached to a cordless impact driver, showcasing the modular connection and professional-grade durability for high-torque fastening tasks.
A graphic showing the versatility of the multi-purpose KNECT M-system adapter, illustrating how it connects quad sockets or traditional sockets to specialized pass-through wrenches and handles.
Two quad sockets stored together on a single steel extension shaft, emphasizing the space-saving design and organized transport of the metric 7mm through 14mm hex sizes.
v
The 653MQS quad socket set case mounted to the side of a larger MODbox rolling tool tower, demonstrating the modular compatibility and accessibility of the system on a busy job site.
How A Quad Socket Works (651QS, 652QS, 653QS, 654QS and 656QS) promotional how to video
KLEIN TOOLS

Klein Tools Impact Socket Set 653MQS KNECT Metric Quad Flip Sockets (12 in 3 Configuration 7mm to 19mm Hex Sizes 1/4 and 3/8 Inch Drive Fastening)

Only 2 left
SKU: 653MQS
$69.98 USD

Description

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Consolidate Twelve Metric Driving Sizes into Three Spring-Loaded Quad Sockets for Rapid Hands-Free Transitions

The Klein Tools 653MQS KNECT™ 12-in-3 Metric Impact Flip Socket Set is an industrial-grade fastening system engineered to condense twelve distinct hex nut sizes into three multi-profile quad components. Optimized for cordless impact tools running 1/4-inch hex or 3/8-inch square drives, this heavy-duty system spans a 7mm to 19mm range via spring-loaded telescopic sleeves that compress smoothly under direct pressure. Forged from cold-forged steel alloy and treated with an anti-corrosion manganese phosphate finish, this space-saving mechanism optimizes on-site structural assemblies, commercial electrical layouts, and automated plant maintenance routines.

Best Used For:

  • Electrical Infrastructure Staging: Mounting variable metric nuts on heavy-duty electrical distribution boxes, strut channels, and solar panel racking frames.
  • Commercial Mechanical Fastening: Securing machinery mounts, foreign flange connections, and industrial equipment fittings without carrying multiple detached bits.
  • HVAC Systems Maintenance: Driving variable assembly fasteners across multi-brand heating, cooling, and ventilation units in tight equipment rooms.

Key Performance & Safety Features

  • 12-in-3 Quad Optimization: Consolidates twelve standard metric hex sockets down to three 4-in-1 tool heads to eliminate loose inventory loss.
  • Spring-Loaded Sleeve Action: Telescopic design retracts automatically under downward placement pressure to enable immediate, hands-free secondary size access.
  • High-Torque Impact Rating: Precision cold-forged from heat-treated alloy steel to safely manage heavy cyclic impacts from power driver hammers.
  • Universal Dual-Drive Integration: Multi-purpose KNECT™ system adapter switches between 1/4-inch quick-change hex shafts and 3/8-inch square driver anvils.
  • MODbox Stackable Compatibility: Packed inside a low-profile storage case engineered with locking latches to anchor natively into modular rolling tool rails.

What's Included

  • (1) Small 4-in-1 Quad Socket (7mm, 8mm, 10mm, 12mm)
  • (1) Medium 4-in-1 Quad Socket (9mm, 11mm, 13mm, 14mm)
  • (1) Large 4-in-1 Quad Socket (15mm, 16mm, 18mm, 19mm)
  • (1) 6.5-Inch KNECT™ Impact-Rated Extension Shaft
  • (1) 1/4-Inch Hex and 3/8-Inch Square Drive Multi-Purpose System Adapter
  • (1) Slim MODbox™ Accessory Case with Small Parts Storage Tray

Technical Specifications

Brand Manufacturer: Klein Tools
Model Number (SKU): 653MQS
Product Type Category: Impact-Rated Quad Flip Socket Set
Input Interface Standards: 1/4 in Hex & 3/8 in Square Multi-Drive Adapter
Socket Fitment Range: 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 18mm, 19mm
Core Tool Metallurgy: Heat-Treated Cold-Forged Carbon Steel
Surface Anti-Wear Finish: Manganese Phosphate Treatment
Geometric Wall Pattern: 6-Point Hex Profile
Storage Case Interface: Klein Tools MODbox Modular Compatible
Overall Box Length: 6.97 in
Overall Box Width: 3.7 in
Overall Box Height: 1.8 in


PRO-TIP: When shifting from smaller nested hex sizes to the deeper outer walls, wipe away metal shavings or grit accumulation inside the spring-loaded channel. Keeping this sliding mechanism free of site debris ensures that the internal spring sleeve telescopes to its full extension, ensuring perfect 6-point engagement and preventing fastener cam-out.