[Use] Just align the precision machining on the clamp center rod with the positioning pin position mark on the board, hold the clamp and drill the hole. The second alignment function allows you to drill a series of evenly spaced holes of the board. Just fix the provided pin on the center rod, insert the pin into the hole, and then drill more holes. [Application] 1/4 inch (6 mm), 5/16 inch (8 mm), 3/8 inch (10 mm), adjustable and clamped on wood boards of different thicknesses, fast, simple and convenient operation [Beautiful tool] Convenient and practical-using the practical joinery punching locator, you can do woodworking more conveniently. Whether you are a senior woodworking enthusiast or a beginner, you can quickly master Material:Metal colour:As shown Package Contents: 1 x Self Centering Dowelling Jig 1 X 1/4inch dowel Pin 1 X 5/16inch dowel Pin 1 X 3/8inch dowel Pin 3 X 1/4inch Drill Sleeve 3 X 5/16inch Drill Sleeve 3 X 3/8 inchDrill Sleeve 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.