Constructed of industrial grade aluminum alloy, it has good strength, high corrosion resistance and long durability. Drill bushings adopt drop forged steel with heat treatment, sturdy and precise for positioning.Wide clamping range from 17mm to 60mm. Equipped with a precision positioning scale, determining the distance between the first hole and the collet. Supplied with 9 drill bushings in 3 sizes, meeting the different needs of wood drilling. This is a professional locator and hole boring tool for woodworking and furniture making. It is small in size, easy to operate, allowing you to drill a hole quickly and easily. Specification: Material of the body of the Tool: 6061 Aluminum Alloy Drill Rings Material: Stainless Steel Drill Rings Size: 6/8/10mm (3pcs/size) Positioning peg size: 6/8/10mm (1pc/size) Clamping range: 17~50mm wood board Blue color Item Size: 23.5*10*3.5cm/9.25*3.94*1.38in Weight: Approx. 861g / 30.4oz Usage: 1. Adjust the positioning scale to determine the distance between the first hole and the end of the map. 2. After fixing the position, select the drill bit that matches the drill rings to start drilling. 3. Remove the scale nuts after drilling three holes 4. Use the locating pin to fix the hole on the third hole (make sure the distance of each hole is the same). 5. Drill all holes straight 6. Stick the wooden round pin firmly with glue in the punched hole Packing list: 1* dowel jig 9 * drill rings 3 * Locating pin Note: 1 .Due to the difference between the monitors and light effect, the pictures may not reflect the actual color of the item. 2. Please auto there will be a slight error due to manual measurement. Thank you for your understanding.