Function: 1 Made of high quality aluminum alloy material with heat treatment for durability 2. Includes drill bit and wooden hole opener for drilling various sizes 3. Equipped with adjustable swivel knobs to fit a variety of wood thicknesses 4. The surface is anodized to improve abrasion resistance and ensure long life 5. This 3-in-1 hole puncher set has high hardness and strength and is very wear-resistant Specifications: Item Type: 3-in-1 Hole Puncher Set Specifications: X150b Material: Aluminum Alloy Surface Treatment: Anodized Drill Bit: Approx. 8mm / 0.3in, about 10mm / 0.4in Hole Opener: about 15mm / 0.6in Package List: 1 x X150b3-in-1 Punch 2 x Auxiliary Tool 1 x Half Moon Wrench 2 x Drills 1 x Wood Anchor 4 x Spacing Ring 4 x Screws, 10 x Embedded Parts 10 x 6 x Nut Square Wrench