Specifications: This is a set of self centering 6 8 10mm drill guide tools for the fixation and centering while drilling and woodworking. Parameters: Drill Guide Bushing: 6/8/10mm. Maximum support plate thickness: 45mm / 1.77in. Wide application: Suitable for fixing on all kinds of on board of different thickness, the two claws are convenient for quickly setting the center of the hole, groove design for discharge dust. Material: Made of Aluminum Alloy 6061 with excellent surface oxidation treatment, with high hardness, wear-resistant, rustproof, solid, durable and excellent for use. Premium Quality&Service: 100% new and High quality. All our products are extensively tested to comply with rigorous and strict QC standards. We offer a 60-day refund guarantee.