[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.