Aluminum alloy material, anodized surface, durable use, not easy to rust. This is a set of drill guide tools for fixing and centering during drilling and woodworking Center lines ensure precise alignment when drilling on various surfaces. The hand drill is used to drill holes in wood planks and board edges to facilitate splice boards. br> Suitable for vertical drilling, hinge drilling, stud drilling pin, draw the middle line on the side of the plate. Feature: 2. This is a set of drill guide tools for fixing and centering during drilling and woodworking. 3. The centerlines ensure precise alignment when drilling on different surfaces. 4. The hand drill is used to drill holes in the wood planks and the edges of the planks to make it easier for the boards to be spliced. 5. Suitable for vertical drilling, hinge drilling, drilling to pin studs, draw the middle line of the side of the plate. Specifications: Material: Aluminum alloy Diameter: 9.8 cm / 3.86 inches Height: 4.7 cm / 1.85 in Package List: