• the tool consists of a square chisel with an auger bit inside
• the auger bit rotates while the square part cuts sharp edges around the hole
• the exact size is given in inches; the size in mm is only an approximate rounded value
• The bit is designed for mortising machines and, with the correct adapter, also for pillar drills.

Use it when making tenon joints and other mortises in hardwood and softwood.

The chisel edges and point must be very sharp during work so the resulting mortise is clean.

• shank: cylindrical 8 mm
• size: 11.1 mm (7/16")
• design: square chisel with an inserted auger bit
• intended for: mortising machines or pillar drills with an adapter
• material use: hard and soft wood
• packaging: plastic tube with hanger
• size tolerance in mm: +/- 2% compared with the inch size

Usually the edge parts of the groove are drilled first to define its length, then the middle section is removed step by step.

Practical advice for working with these bits can be found in thehollow chisel mortising bits category description.