The P&N® QUICKBIT range has been specifically developed to provide users quick change-over of accessories in tools such as Impact Drivers and other power tools that feature 1/4"-Hex Quick-Change Tool Holders. This comprehensive range of power drill bits, accessories and attachments is suitable for both 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. There’s no more need for repetitious chuck loosening and tightening or using two drills. Product Description P&N® QUICKBIT HSS Drill / Countersinks are designed to drill screw pilot holes and countersink in one action. They feature a High Carbon Steel (HCS) countersink and a HSS drill bit. These drill countersinks are suitable for use with timber, particle boards and plastics. Features HSS Drill Bit and HCS Countersink - For use in timber, particle boards and plastics, Removable Drill Bit - These bits can be replaced when worn increasing the tool life, 1/4"-Hex Shank - For use with Quick-Change Adaptors, Specifications Drill Diameter: 9/64" (3.57mm) - Suits 10-12G Screws, Countersink Angle: 82°, Shank: 1/4-Hex with Power Groove,