Studio view of the Klein Tools 16-piece long hex bit socket set organized in an open orange MODbox case with a clear lid.
Close-up front view of the open socket set showing the sixteen extended reach hex bits standing upright in the orange storage tray.
Infographic detailing the set contents, listing eight SAE sizes from 5/32 to 1/2 inch and eight metric sizes from 4mm to 12mm.
Diagram of a single hex bit socket highlighting the S2 steel construction, stamped size markings, and 4.9 inch overall length.
Close-up feature shot focusing on the knurled chrome base of the socket, designed to provide grip for hand-turning fasteners.
Angled view demonstrating the MODbox compatibility, showing the socket case stacked on top of another unit with the lid partially open.
High-angle studio view of the full 16-piece socket set inside the durable orange modular case.
Studio view of the Klein Tools 16-piece long hex bit socket set organized in an open orange MODbox case with a clear lid.
Close-up front view of the open socket set showing the sixteen extended reach hex bits standing upright in the orange storage tray.
Infographic detailing the set contents, listing eight SAE sizes from 5/32 to 1/2 inch and eight metric sizes from 4mm to 12mm.
Diagram of a single hex bit socket highlighting the S2 steel construction, stamped size markings, and 4.9 inch overall length.
Close-up feature shot focusing on the knurled chrome base of the socket, designed to provide grip for hand-turning fasteners.
Angled view demonstrating the MODbox compatibility, showing the socket case stacked on top of another unit with the lid partially open.
High-angle studio view of the full 16-piece socket set inside the durable orange modular case.
KLEIN TOOLS

Klein Tools Socket Set 652216HEXL 16 Piece SAE Metric 3/8 Inch Drive Long Hex Bit Extended Reach Tool Box MODbox Case Mechanical Alignment Array

In stock
SKU: 652216HEXL
$59.99 USD

Description

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Industrial-Grade 16-Piece Extended Hex Bit Socket Assortment with High-Strength Chrome-Vanadium Construction, Knurled Finger Grips, and Modular Storage Organizer Case

The Klein Tools 652216HEXL 16 Piece Long Hex Bit Socket Set SAE Metric 3/8 Inch Drive Extended Reach MODbox Case delivers specialized deep-set fastener rotation utility and exceptional low-clearance adjustment efficiency across demanding commercial HVAC machinery, electrical control blocks, and heavy industrial vehicle systems. Engineered with a standard 3/8-inch square drive connection hub that mounts natively to professional manual ratchets and spinner handles, this premium 16-piece alignment kit features cold-forged Chrome-Vanadium steel sockets carrying extra-long hex bits to access recessed hardware without cross-threading defects. This professional contractor solution resolves restricted workspace access limitations, slow finger-starting bottlenecks on slick fasteners, and scattered tool case clutter by combining extended structural steel bits with distinct knurled friction bands, high-contrast size stamps, and a modular locking outer shell enclosure. Outfitted with a complete sizing matrix containing 8 SAE elements from 5/32 to 1/2 inches and 8 Metric elements from 4mm to 12mm, a rugged 11.38-inch modular storage case, a black phosphate anti-wear tip coating, and a 4.3 lb total net kit mass, this robust hardware system optimizes subcontractor maintenance efficiency during extensive equipment overhauls, tight junction box internal mounts, and motor bracket adjustments.

Best Used For:

  • Recessed Equipment Service Operations: Reaching deep into tight fan motor shrouds, commercial compressor housings, and industrial generator panels to turn internal hex hardware cleanly.
  • Dual-Standard Fleet Adjustments: Transporting a single consolidated kit to adjust both domestic SAE fasteners and imported metric machinery panels single-handedly without returning to a central storage chest.
  • Precision Hand-Start Staging: Utilizing the integrated knurled perimeter rings to finger-spin hardware safely inside narrow castings, avoiding cross-threading errors before applying full lever torque.

Key Performance & Safety Features

  • Extended Tool Bit Reach: Elongated mechanical layout bypasses structural block components seamlessly, supplying unobstructed tool lines to deep internal fasteners.
  • Chrome-Vanadium Core Steel: Premium tempered Cr-V steel structural base dampens rotational stress spikes, preserving internal hex tip geometries under heavy load cycles.
  • Non-Slip Base Knurling: Specialized micro-textured surface borders optimize manual finger control variables, accelerating early installation thread matching.
  • MODbox System Alliance: Form-fitted storage case hooks directly into matching component tracks, stacking safely with modular rolling storage boxes to protect field cargo.
  • Protective Black Phosphate: Wear-resistant industrial surface treatment seals tool bit faces continuously against moisture accumulation and high-friction operational scarring.

What's Included

  • (8) 3/8-Inch Drive Long SAE Hex Bit Sockets: 5/32 in., 3/16 in., 1/4 in., 9/32 in., 5/16 in., 3/8 in., 7/16 in., 1/2 in.
  • (8) 3/8-Inch Drive Long Metric Hex Bit Sockets: 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 12 mm
  • (1) MODbox™ Modular Component Compatible Rigid Protective Carrying Case Organizer

Technical Specifications

Specification Value
Brand Name Klein Tools
Model Number 652216HEXL
Square Drive Connection Size 3/8 in. Square Internal Fitment
Total Multi-Pack Socket Quantity 16 Pieces
Measurement Matrix Systems Dual-Scale SAE (Fractional Imperial) and Metric
Core Hardened Metallurgy Base Chrome-Vanadium Steel (Cr-V) Alloy
Anti-Wear Surface Finishes Mirror Polish Chrome Body / Black Phosphate Tip Coating
Modular Storage Case Integration MODbox™ Stack System Rails Alignment
Case Outside Footprint Length 11.38 in.
Case Outside Footprint Width 7.5 in.
Case Outside Footprint Height 1.63 in.
Total Mechanical Net Mass Weight 4.3 lbs.

Pro-Tip: When breaking loose highly corroded, deep-set engine socket cap fasteners, apply absolute straight downward pressure over the ratchet center head while engaging rotational breakaway force. Keeping the extended bit square with the hardware entry socket channels blocks out off-axis flex forces and stops core bit tool failures completely.