trunnion centering device: Wide clamping range, the maximum is 60mm. wood dowel: The drill bushings adopt 60CR steel material, high strength and precise positioning Kit of Drilling Guide: Comes with 9 drill bushings in 3 sizes, meets different needs of woodworking drilling process doweller : Equipped with a positioning scale, determining the distance between the first hole and the clamp drilling template: It is made in industrial grade 6150 aluminum alloy with good strength, high corrosion resistance, long life and durable Specifications: Material: Aluminum alloy Color: Blue Drill Rings Size: 6/8/10mm (3pcs/each type) Positioning peg: 6/8/10mm Suitable wood size: 17-60mm/0.67-2.36inch Size: 23.5 x 10 x 3.8cm/9.25 x 3.94 x 1.50inch Weight: 781g Sold by Briday Store