Square Hole Drill Bit Sets, Woodworking HSS Wood Mortising Chisel Countersink Bits Hole Mortise Drill Bit Set with Adapter, 6.4mm 8mm 9.5mm 10mm 11mm 12.7mm 14mm 16mm (4PCS)

• Drills precise holes with little pressure: Using different specifications of the square hole drill, matching the appropriate power of the square hole machine, you can play a square hole to meet the requirements: 1/4 Inch (6.4mm), 5/16 Inch (8mm), 3/8 Inch (9.5mm), 2/5 Inch (10mm), 7/16 Inch (11mm), 1/2 Inch (12.7mm), 9/16 Inch (14mm), 5/8inch(16mm). you can chose the size you want.
• High Efficiency and Labor Saving: square wood chisel drill bits with standard chip design, easy to remove the side of wood chips, improve drilling efficiency. Reduces the labor intensity of construction workers, accelerates construction speed, reduces construction costs for construction, installation, renovation, decoration.
• MATERIAL: This square mortising chisel set is made of special steel, heat treatment, HRC48-50, offers high hardness, lengthened core, and high concentricity.
• Fit Machine: Great for drilling square holes in wood with a mortising machine or a mortising attachment. Fits all mortising machines and drill press attachments. Square hole drill is mainly used for woodworking aspects. Clamp diameter range is about 38-55mm/1.50-2.17 inch. Coming with a screw for enhanced fixation.
• Note: This square hole drill bit adapter is not suitable for lithium battery electric drills and bench drills without round hole bearings. It’s suitable for old-fashioned bench drills and household bench drills.

Specification: Material: high-speed steel Special steel, heat treatment, HRC48~50, high hardness, lengthened core, high concentricity. Hardness: HRC48-50 Size: 1/4 Inch (6.4mm), 5/16 Inch (8mm), 3/8 Inch (9.5mm), 2/5 Inch (10mm), 7/16 Inch (11mm), 1/2 Inch (12.7mm), 9/16 Inch (14mm), 5/8inch(16mm) Clamping shank diameter: 19mm (Round) Shaft length (Drilling depth): 1/4"(6.4mm): 47mm 5/16"(8mm): 51mm 3/8"(9.5mm): 54mm 2/5" (10mm): 54mm 7/16"(11mm): 60mm 1/2"(12.7mm): 75mm 9/16"(14mm): 75mm 5/8"(16mm): 75mm Package Includes: SET 1: 6.4mm 8mm 9.5mm 12.7mm Square Hole Mortiser Chisel Bits 1 * Square Hole Drill Bit Adapter SET 2: 6.4mm 8mm 9.5mm 11mm 12.7mm Square Hole Mortiser Chisel Bits 1 * Square Hole Drill Bit Adapter SET 3: 6.4mm 8mm 9.5mm 10mm 12.7mm 14mm 16mm Square Hole Mortiser Chisel Bits 1 * Square Hole Drill Bit Adapter