The Dowel Jig Kit for floating shelf bracket has the self centering function, avoiding you from potentially wrong angles and ruining beautiful partitions, helping you drill a straight hole. Quality Materials Multi-purpose Our dowel jig kit can not only drill 1/2-inch holes for installing floating shelves,hiding brackets,mantels,drilling,and other woodworking tasks Corrosion Resistance The dowel Jig can adjust the position of the legs to accommodate the different thicknesses of the boards. Perfect self Centering Accurately grasp the stability and perpendicularity of the drilling hole, and easily have a completely straight hole.The black surface is fully covered withblack powder coating to maintain a good finish, high hardness, wear resistance and toughness. Size Suitable for 1/2-inch, 15 mm depth drill sleeve, great 1/2 inch straight holes can be drilled quickly Easy Carry Convenient compact and easy to assemble and use, free hands, drill more stable. Easy to Use Easy to install, only take two minutes of your time to complete safely. Included Components Dowel jig self centering x 1 screw x 2