Self Centering Doweling Step Drill Guide Bushings Set Wood Dowel Woodworking Joints Tools Features 1.Clamp the Doweling Kit with Doweling Bushings on a workpiece to effortlessly drill dowel pins that require precise right-angles and exact alignment; No measuring or calculating necessary; You can even take precision a step further and mark and align the to get perfect results. 2.4 extremely accurate guide holes for the supplied bushings which makes this an essential part of every carpenters toolbox for serious joining of miter, butt, and edge joints; Solid steel guide center holes are precision drilled and reamed to exact size for maximum accuracy so you can drill bit for mortising, constructing wooden frames, and repairing tables; Ease of use and strength of make it perfect for trade school and woodshop class; No loose parts to get lost. 3.Solid precision hardened steel center block construction for ultimate strength and longevity; Large steel clamping screw tightens the tool like a vise with the rugged aluminum sides holding your work securely without damaging your application; Regularly clean and lightly oil the center screw for smooth action. Specifications Size146x120x72mm Maximum capacity:2-1/2" Drill bushing: As shown in the figure Package Included: 1 x Woodworking Positoner 6 x Drill bushing