Hidden Bolt Fasteners (10 Pack) – Matching Step Drills (Optional) – for DIY Knife Handles -Select Color, Size, and Combo Above These are Hidden Bolt Fasteners. They are used for knife handle attachment. With this design, you will create a step hole in your handle material that is slightly larger than the shank of the fastener. The two-part assembly allows for you to pass the shank precisely through your knife tang hole and handle material, allowing the larger radius of the fastener heads to create a pinch point on both sides of the handle material, where it can then be tightened down to a secure hold. Once the hidden bolt has been tightened, it can be sanded to a flush finish with the knife handle surface. This will result in a smooth, pin-like visual effect. When used with epoxy and/or thread-locker adhesive, they will create a permanent handle bond. For more knife making kits, knife making supplies, and knife parts, see ( https://www.ebay.com/usr/ckkindustries)