The clamp can be adjusted by a knob to fit wood boards of different thicknesses. Made of high-quality aluminum alloy and heat-treated for durability. Features high hardness and strength, very wearresistant, dependable to use. This is a practical tool set for furniture factories and woodworking enthusiasts. Equipped with drill bit and woodworking hole cutter , which can make holes of different sizes. Colour:blue+black Material:aluminum alloy Size:5.7 x 4.9 x 4.5cm Package Contents: 1 x Punching Locator 3 x Drill Bit 3 x Limiting Ring 1 x Guide Bushing 4 x Screw 1 x Hexagonal Wrench 10 x Eccentric Nut 10 x Embedded Parts 10 x Connecting Rod 20 x Round Pin 1 x Wrench 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.