For precision hole boring. Self piloting point combined with trepanning style cutting action will produce overlapping holes in any direction. Ideal for scroll and scalloping applications. Suitable for use in bench and pillar drills to bore a wide range of timber, plastics and other materials. Boxed Sets Contents: 5 Piece: 1x each 15, 20, 25, 30 and 35mm. 15 Piece: 1x each 10, 12, 15, 16, 18, 20, 22, 25, 26, 28, 30, 35, 40, 45 and 50mm. Shank Diameter: 10mm