1、Made of high quality aluminum alloy 6061 and anodic oxidation treatment for durability 2、High hardness and strength, very wear-resistant 3、The drill guide is adjustable to clamp on different thickness of wood boards from 17mm to 50mm 4、Comes with 6mm, 8mm and 10mm bushings for making different sizes of holes 5、With 6/8/10mm positioning pins, easy to drill a row of holes with equal spacing Description: This drill guide set is a practical woodworking tool for dowel holes drilling. Easy to operate, it can be adjustable to clamp on different thickness of wood boards from 17mm to 50mm. This kit includes  6/8/10mm bushings and positioning pins, making it easy to drill holes with equal spacing. Features: Made of high quality aluminum alloy 6061 and anodic oxidation treatment for durability. High hardness and strength, very wear-resistant. The drill guide is adjustable to clamp on different thickness of wood boards from 17mm to 50mm. Comes with 6mm, 8mm and 10mm bushings for making different sizes of holes. With 6/8/10mm positioning pins, easy to drill a row of holes with equal spacing. Specifications: Condition: 100% Brand New Color: Red Material: Aluminum Alloy 6061 + Steel(drill bushing) + Brass (Nut) Surface Treatment: Anodic oxidation Material of Drill Bushing: Steel HRC50° Positioning Pin: 6/8/10mm Clamping Wood Range: 17-50mm Size: approx. 23.5 x 10 x 3.5cm / 9.25 x 3.94 x 1.38in Weight: approx. 977g Package Included: 1 x Self Centering Dowelling Jig 9 x Drill Bushings (3pcs 6mm, 3pcs 8mm, 3pcs 10mm) 3 x Positioning Pins (6/8/10mm)