1、Wear Resistant And Durable: Self centering doweling jig is made of good quality material, wear resistant, durable, and corrosio resistant 2、6mm, 8mm, 10mm Hollow Nuts: There are a variety of 6mm, 8mm, 10mm hollow nuts, easy to replace, to meet the various needs of users 3、Adapt To Center of Board: Doweling jig can adapt to the center of the board, install the dowel after punching to join the two boards 4、Positioning And Drilling: There is an angle of 90 degree, which can be used for positioning and drilling the wooden stick and the 90 degree wooden block 5、Oxidation And Electroplating Surface Treatment: Using oxidation and electroplating surface treatment, not easy to damage, bring longer service life