The Faithfull 5 Piece Forstner Bit Set, used for drilling in woodworking in preference to drill bits and flat bits whenever a very clean and precise hole is required. They also enable woodworkers to drill holes without passing through the material when a clean and precise bottom to a hole is required. Supplied in an aluminium storage case. Sizes 15, 20, 25, 30 and 35mm. Shank Size 8mm.