This dowel jig is made of industrial grade 6150 aluminum alloy with good strength and high corrosion resistance, durable and long service life. Large tripping range, the maximum is 60mm. Comes with 9pcs drill bushings in 3 sizes, meeting different needs of drilling wood holes. Specifications Material: Aluminum alloy < p>Blue color Drill bushing size: 6/8/10mm (3pcs/each type) Positioning dowel: 6/8/10mm Suitable wood size: 17-60mm/0.67-2.36inch Size: 23.5x10x3.8cm/9.25x3.94x1.50inch < p>Usage 1. Adjust the positioning scale to determine the distance from the first hole to the end of the card. 2. After fixing the position, select the drill bit that matches the drill bushings to start drilling. 3. Remove the nuts from the scale 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 round wooden stick firmly to the punched hole with glue. Package Included: 1 x