General description This Trend SNAP/PC/A Snappy 4 Piece Set includes two drill countersinks and matching plug cutters, designed for creating countersunk holes in timber for screws that can be plugged with a matching plug or pellet made using the plug cutter. Technical specifications Plug cutters made from Tool Steel Plug cutters are slightly tapered Drill/Countersink Sizes: 3/8" (9.5 mm), 27/64" (22.75 mm) No.10 Drill/Countersink Size: 1/2" (12.7 mm) Shank Diameter: 1/4" hex Screw Sizes: No.8, No.10 Installation Recommended to use plug cutters in a pillar drill