Forstner bits are used for drilling in woodworking in preference to drill bits and flat bits when a clean and precise hole is required Ideal for when a specific depth of mortise is required The design of the bit results in minimal tear out, for a much neater cut than a spade bit or hole saw Bore very precise flat bottom holes in wood Manufactured from heat treated steel for strength and durability Can cut on the edge to a block of wood and can also cut overlapping holes The bit has a centre point which gives a centre point start and guides it during the cut, allowing for accurate results each time 3/8" shank that fit almost most lathes / presses and drills (whether cordless / electric or air) Allows holes to be drilled without passing through the material when a clean and precise bottom to a hole is required Can also be used with a drill press to cut angled holes This listing is for a 19mm forstner bit