Descriptions P&N Quickbit Rosehead Countersinks CRV are suitable for countersinking screw holes in aluminium, wood & plastic. Made from Chrome Vanadium for increased performance. The P&N Quickbit range has been specifically developed to provide quick change-over of standard 1/4′′ hex shank power bits. This comprehensive range of power drill bits and accessories is for trade and home handyman use and allows the operator to simply and efficiently use one power tool for all operations. Central to the range is the Quickbit Adaptor, which aids in the simple change over and instant locking of any 1/4′′ hex shank bit without the use of a chuck key. Changing from a drill to a screwdriver bit is no longer a laborious task, and there’s no more need for repetitious chuck loosening and tightening or using two drills. Dimensions d1 (in): 1/2, 5/8, 3/4 Screw Head: M6, M8, M10 Shank (in): 1/4 Quantity: 3 Features 1/4” hex shank suits impact drivers and quick-change adaptors Sizes suitable to match common screw heads Tough grade high-alloy Chrome Vanadium steel offers superior performance ISO 14001: Sandblasted finish guarantees zero heavy metals Specifications Material: Chrome Vanadium Finish: Bright Point Type: 90°