Our wood dowel jig can clamp a wide range of wood blocks from 0.4 to 2 inches, either round or square. Takes the hassle out of limited jig options and gives you more room for diy woodworking creations. This doweling jig is made of aircraft-grade aluminium alloy and heat-treated 45 steel, with excellent characteristics of ultra-high hardness and resistance to deformation, ensuring that it you for a long time. This upgraded dowel jig features accurate drill positioning and clear auxiliary ruler markings to make your woodworking easier and more precise. This dowel jig kit can be used for mortise and tenon joints, building wooden furniture, installing railings, and is a must-have tool for diy enthusiasts and professional woodworkers. You get a professional self centering dowel jig, 6 rust- steel bushings (2 x 1/4Inch, 2 x 3/8Inch, 2 x 5/16Inch). Colour:As Shown Material:Metal Package Contents: 1set * woodworking tools Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.