Features 8 Drill Bushings: The kit contains 8 specifications of metal drill bushings from 3mm to 10mm, with high hardness and are not easy to wear. Fast Positioning: The center position can be quickly located, accurate and efficient, the maximum thickness of board supports 45mm. Aluminum Alloy Made: The drill guide is made of aluminum alloy with anodized surfaces, which is not easy to rust, ensures stability and durability. Easy Operation: With 6mm and 8mm card slots, and parallel line check slots, you can complete alignment and drilling easily. Furniture Installation: Widely used for precise positioning of furniture boards when punching, with good perpendicularity, so that the boards can be spliced better. Specification: Item Type: Self Center Dowel Jig Material: Aluminum Alloy Color: Red Drill Bushing: Approx. 3mm/0.12in, 4mm/0.16in, 5mm/0.2in, 6mm/0.24in, 7mm/0.28in, 8mm/0.31in, 9mm/0.35in, 10mm/0.39in, meeting various hole opening sizes Purpose: Woodworking tools Package List: 1 x Self Center Dowel Jig 8 x Drill Bushings Package List 1 x Self Center Dowel Jig 8 x Drill Bushings