Egg Cup Bushings are right angle drilling guides for accurate pistol drill alignment. Boneham Egg Cup bushing fixtures are designed to provide and accurate and portable drilling fixture. The aluminium cup element is light and durable. Furthermore, Egg cup bushings are ideal for applications in sheet metal or rivet drilling in aerospace. Egg cup bushings can also be used for 3 stage operations such as pilots, drills and reams. Boneham egg cup bushings use SF and SFM standard bushings and lock screws. This is interchangeable tooling with standard fixtures and handle bushings.