The Trend Snappy Flip Over Driver Set - 4 Piece Set - is for tasks involving multiple piloted countersink and screwing work, the Trend Snappy Flip Bits are designed to speed up the task using a double-ended driver and countersink combination. A very fast and efficient way to pilot, countersink and drive screws by simply flipping the bit to move from drilling to driving, increasing productivity and efficiency across all working practices. They are supplied with a quick-change shank for fitting into Trend Snappy Quick Chuck with three double ended screwdriver and piloted countersinks for No6, 8 and 10 gauge screws. The drill lengths can be adjusted for different piloting depths with each one fitted with No 2 Pozi drive insert bits. Specifications: Main Body Adaptor Diameter: 17mm. Overall Length: 102mm.