The clamping plates on both sides are made of industrial grade aluminum alloy, and the drilling guide center is made of steel, which is processed by precise computer numerical control. When you turn the middle bolt, the aluminum clamps on both sides will be tightened at the same time, realizing the automation of center positioning. Select the hole position, adjust the fixture to fix the fixture, insert the drill bit into the guide bushing of the fixture and drill the hole. The auxiliary positioning marks of the drill bit can be directly aligned in the center, so as to realize simple and convenient accurate drilling. Our self-centering nail fixture can be used in materials, including wood, metal and plastic. Its adjustable guide rail and multifunctional positioning enable you to create pin holes with different sizes and distances to meet different project requirements. The drill bushes are characterised by high quality material, high strength and precise positioning. Suitable for drilling holes and making joints from wooden boards, perfect tool for panel furniture. Name: Woodworking Punching Locator Set Specification: English system Colour:silver+black Material:Aluminum alloy + steel Package Contents: 1 x Carpenter punching locator set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.