Studio view of three blue Bosch Edge hole saws in varying diameters, each featuring a hex shank, integrated pilot bit, and ejection spring.
Front view of the retail blister pack containing the three-piece hole saw set, displaying sizes 7/8 inch, 1-1/8 inch, and 1-3/8 inch with Impact Tough branding.
Graphic titled Application Materials displaying a close-up texture of brushed steel labeled Thin Metal to indicate the primary use case.
Action shot of a blue impact driver using the Edge hole saw to drill a clean hole into the top of a metal electrical box.
Studio view of three blue Bosch Edge hole saws in varying diameters, each featuring a hex shank, integrated pilot bit, and ejection spring.
Studio view of three blue Bosch Edge hole saws in varying diameters, each featuring a hex shank, integrated pilot bit, and ejection spring.
Front view of the retail blister pack containing the three-piece hole saw set, displaying sizes 7/8 inch, 1-1/8 inch, and 1-3/8 inch with Impact Tough branding.
Graphic titled Application Materials displaying a close-up texture of brushed steel labeled Thin Metal to indicate the primary use case.
Action shot of a blue impact driver using the Edge hole saw to drill a clean hole into the top of a metal electrical box.
Studio view of three blue Bosch Edge hole saws in varying diameters, each featuring a hex shank, integrated pilot bit, and ejection spring.
BOSCH

Bosch Bi-Metal Hole Saw Set HTWS 3 Piece Impact Tough Sheet Metal Cutter Kit 1/4 Inch Hex Shank Integrated Depth Stop For Electrical Conduit

In stock
SKU: HTWS
$38.69 USD

Description

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High-Torque Sheet Metal Hole Saw Set for Precision Conduit and Pipe Penetrations

The Bosch HTWS Edge Impact Tough Hole Saw Set is a 3-piece bi-metal cutter system engineered for rapid, clean round penetrations through industrial sheet metal. Each integrated one-piece hole saw features high-speed steel 8-TPI teeth designed to endure the intense torque of modern 1/4-inch hex impact drivers while delivering twice the operating life of standard alternatives. A built-in shoulder depth stop prevents unwanted surface breakthrough and protects sensitive underlying structural or electrical components during drilling operations. This set eliminates the requirement for separate arbors and utilizes automatic spring ejection to immediately clear slugs from the cutting cup.

Best Used For:

  • Electrical Conduit Installation: Cutting clean 7/8-inch, 1-1/8-inch, and 1-1/3-inch entry ports into steel service panels and junction boxes.
  • HVAC Duct Modifications: Boring burr-free access holes in sheet metal ductwork for linesets, pressure gauges, and sensor probes.
  • Plumbing Pipe Routing: Fabricating accurate clearances through thin gauge metal studs and utility enclosures for copper or PEX tubing.

Key Performance & Safety Features

  • Extended Lifespan: Bi-metal construction provides up to 2X the service life compared to standard impact-rated hole cutters.
  • Sheet Metal Optimization: Precision-ground 8-TPI tooth geometry cuts smoothly without tearing or leaving hazardous burrs.
  • Safety Depth Stop: Built-in collar preventing over-penetration protects components directly behind the target surface.
  • Automatic Plug Ejection: Heavy-duty pilot bit spring automatically expels metal cores immediately upon completing the cut.
  • One-Piece Configuration: Monoblock assembly removes the complexity and vibration associated with multi-piece arbors.

What's Included

  • (1) 7/8 In. Edge Hole Saw
  • (1) 1-1/8 In. Edge Hole Saw
  • (1) 1-3/8 In. Edge Hole Saw

Technical Specifications

Brand Bosch
Model Number HTWS
Series Edge™ / Impact Tough™
Material Bi-Metal / High Speed Steel
Tooth Pitch 8 TPI
Shank Type 1/4 In. Hex Shank
Primary Application Sheet Metal Drilling
Number of Pieces 3
Included Sizes 7/8 in, 1-1/8 in, 1-3/8 in
Arbor Type Integrated One-Piece

Pro-Tip: When using high-torque impact drivers, allow the tool speed to do the work rather than leaning heavily on the driver. Excessive downforce can bind the teeth, while light, steady pressure enables the 8-TPI bi-metal profile to clean out sheet metal smoothly.