Quick and easy to use. High hardness, high torque, quality assurance, durable and long service life. Material: 6061 aluminum alloy + steel (drill ring) + brass (nut), Drill ring material: HRC50° steel Anodic oxidation treatment surface & HRC50° steel material ensures good working performance and helps improve efficiency. Adjustable stop and drill with precision, drill an evenly spaced hole along the length of the wood. Suitable timber size: 1750 mm. Product description It is a good set of tools for furniture makers and woodworking enthusiasts. Adjustable to clamp on different thicknesses of wooden boards from 17mm to 50mm. Specifications: Material: 6061 aluminum alloy (drill guide), steel die (bush) Drill sleeve material: HRC50° steel Material: 6061 aluminum alloy+steel(drill sleeve)+brass(nut) Surface treatment: Anodic oxidation treatment Anodic oxidation treatment surface & HRC50° steel material ensures good working performance and helps to improve efficiency Suitable timber size: