Feature: When positioning the anchor holes of two plates, the stud centering tool can reduce the trouble of frequently using ruler measurements. Easy to use, accurate position, easy to carry and store. According to the hole size, 4 sizes can be chosen: 6mm, 8mm, 10mm, 12mm (4 pieces per style). Made of Q235 chrome steel, durable, wear-resistant, corrosion-resistant, necessary for woodworking. Application: Simply drill a row of holes in one plate, slide the stud into it, and press it onto the other plate. The dots in the middle of the fiducial mark can exactly mark the hole positions on the other board. Material: Chrome-plated Q235 steel Size: 6mm, 8mm, 10mm, 12mm Includes: 4 x 6mm Centering pins 4 x 8mm Centering pins 4 x 10mm pin centerers 4 x 12mm pin centerers ankle