General description Silverline Hinge Drill Bit Set includes three high-speed steel (HSS) drill bits designed specifically for creating accurate, centered holes for door hinges. The set features a spring-loaded, knurled sleeve that allows for easy positioning and drilling without damaging the door furniture. Technical specifications Material: High-Speed Steel (HSS) Sizes: 2mm, 2.8mm, and 3.6mm Usage Position door hinges accurately using the drill bits as templates. Drill directly through the hinge holes for precise installation.