• Drill-hole Sizes: 1/4", 5/16", 3/8", 7/16", 1/2". 6 hardened steel bushings: 2 each of 1/4", 5/16", 3/8".
• Adjustable to clamp on different thickness of wood boards from 3/8" to 2-3/8", quick operation, simple and convenient.
• Surface treatment: Anodic oxidation treatment. High quality aluminum alloy 6061(drill guide) and die steel(bushing), high hardness and strength, good wear-resistant and durable to use.
• Drill equally space hole along the wood. It is a great tool set for both furniture factory and woodworking enthusiasts.
• Warm Tip: If the left and right distance of the splint is found to be asymmetric during use, it can be easily adjusted by yourself. Please refer to the instructions in A+ for details.