Profession Woodworker 7/8 Inch Square Hole Drill Bits Mortising, Mortise Chisel & for Construction Installation Renovation Decoration Industry
1.It is only suitable for square hole drills and mortise tenon machine, not for hand drills, bench drills, etc.
2.It is only suitable for wood products such as MDF, particle board, compressed version, plastic, wood (sandalwood, pine, ash, beech), etc., not for metal, glass, concrete, gypsum board material processing.
3.The tenon machine cannot be used for milling grooves, only manual grooving.
4.If there is no tenon machine, first use the drill core of a bench drill or electric drill to make a few more holes, and then use the square chisel of the square hole drill to strike (note that be slow when striking).

Specification:
Material: Super-strength
Square Hole: 7/8 Inch (22mm)
Holder Diameter: 3/4 Inch (19mm)
Shank Diameter: 1/2 Inch (12mm)
Chisel Depth: 2-3/4 Inch (69mm)
Total Length: 8-5/8 Inch (220mm)
Package included: 1 pc x 7/8 Inch woodworking Mortising Square Hole Drill Bit

Instructions:
1. Square Chisel: The force point of the drill bit sleeve is on a plane, which effectively protects and avoids dangerous situations such as bursting.
2. Durable Drill Bit: Made of High-carbon steel, through heat processing, with high hardness and long service life.
3. U-shape Groove: Designed to facilitate the discharge of wood chips to improve drilling efficiency.
4. Round Shank: Universal shank type, the drill tail adopts a circular design, which makes the clamping more stable, suitable for drilling square holes in wood with a mortising machine or a mortising attachment.

All of Our Tools for Profession Comes with 100% Satisfied Customer Services- Lifetime Warranty- 12 months money back guarantee or exchange- In order to ensure the quality, our products have been inspected 5 times before leaving the factory.