DescriptionStep Drill Bits for CorbyThis step drill is designed to drill holes and recesses to snugly fit the specialized screws and handle fasteners used in the knife and gun-making industry. It will also work for many other applications where you are recessing appropriately sized screws. These are made from high-quality HSS bits. Each one is turned to our rigid specifications and is very precise. They feature a brad-point tip to center the entry point on your material (essential to accurate hole placement). We do not recommend using this model on steel or metal as they are designed for handle materials and composites, such as wood, bone, carbon fiber, phenolic resin-based materials, and much more. They also work well for many other specialty precision uses, such as modeling, woodworking, and crafts.Corby Drill Bit .120 x .156 This model is designed for setting Corby Bolt fasteners or any fastener featuring a 0.120 inch pilot diameter and 0.156 inch head diameter or less. Specifications Designed for: Corby Bolt Fasteners Bit Dimensions = (0.156 step x 0.120 pilot) Inch Material = HSS – High-Speed SteelCorby Drill Bit .120 x .187 This model is designed for setting Corby Bolt fasteners or any fastener featuring a 0.120 inch pilot diameter and a 0.187 inch head diameter or less. Specifications Designed for: Corby Bolt Fasteners Bit Dimensions = (0.187 step x 0.120 pilot) Inch Material = HSS – High-Speed SteelCorby Drill Bit .186 x .250 This model is designed for setting Corby Bolt fasteners or any fastener featuring a 0.186 inch pilot diameter and a 0.25 inch head diameter or less. Specifications Designed for: Corby Bolt Fasteners Bit Dimensions = (.250 step x .186 pilot) Inch Material = HSS – High-Speed SteelCorby Drill Bit .213 x .312 This model is designed for setting Corby Bolt fasteners, or any fastener featuring a 0.213 inch pilot diameter and a 0.312 inch head diameter, or less. Specifications Designed for: Corby Bolt Fasteners Bit Dimensions = (0.312 step x 0.213 pilot) Inch Material = HSS – High-Speed Steel
