WoodOwl OverDrive 1/2" Diameter Fast Boring Auger Bit Makers Cabinet Sheaths The glass stones measure 210

The glass stones measure 210 mm x 70 mm x 10 mm (8-1/4" x 2-3/4" x 3/8") and are made in Japan

1/2" and 3/4"

with legs that are  6mm and 5 mm wide

but cut somewhat faster because of the square cut teeth

so that the entire thickness can be used without cracking or breaking

WoodOwl OverDrive 1/2" Diameter Fast Boring Auger Bit Makers Cabinet Sheaths The glass stones measure 210This 1 2" diameter OverDrive auger bit from WoodOwl is made in Japan by Star M International who have been making drill bits since 1923. They are made from S55C Steel and are designed to be used in portable drills and drill presses in addition to slower methods such as hand braces. When used in cordless drills they cut very quickly, save up to 35% of battery life, and yet create quite a smooth hole with minimal blow out on the exit and entry surfaces.