"Snappy HSS 12.7mm diameter countersink with adjustable drill. • Countersink with pilot drill designed for Imperial gauge screws. • The perfect, fast swap accessory for clean, consistent finishes. • Made from hardened tool steel for assured performance. • Fitted with high quality replaceable HSS (High Speed Steel) designed for piloting in hardwoods using No4 Imperial gauge screws. • Easily adjustable drill length for different timber thicknesses and fast alignment. • Can be used to make countersinks and also counterbores when used with Trend Snappy SNAP/PC/95T or SNAP/PC/38 Plug Cutters for applications where the fixings need to be hidden.