Set of 16 Pieces Bits, Drill And Boring, Forstner, 16pc Titanium Coated Forstner Set 1 set 16 pieces forstner of 1/4'' to 2-1/8'' bit size range. Shank Diameter=3/8 in Pre-sharpened and ready to use in any type of wood Forstner bits bore smooth, flat bottomed holes with clean edges. High speed steel material with titanium coated