Details:* Machined with external marking points, used to accurately align inventory for proper placement of studs or tenons* Expansion pins made of steel so it can be used on hardwood and softwood* Simply drill one set of holes, slide the stud centers in, and press the joint together* Points on the stud centers accurately mark the locations of the holes on the other pieceSpecification:* Type: solid/hollow* Color: Silver* Material: A3* Surface Finishing: Chrome Plating* Optional Size: 6mm, 8mm, 10mm, 12mm (Approx)* Quantity: 4pcs Use Steps:1. After the wooden tenon is connected to the wooden block, the wood round tenons is covered with a wooden tenon2. Align the top of the head with another block of wood that needs to be cut3. Thus, on the second block of wood there is a sign of a round head4. Use a drill bit to drill a round head, then the two pieces of wood are perfectly connected without dislocation and tenon Package Included: 4 * Dowel Centering Pins (6mm/8mm/10mm/12mm)Note:1. The actual colors of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.