Product Description Color: Silver Material: A3 Steel Surface Finish: Chrome Plated Type: Hollow Quantity: 2pcs of each size(6mm, 8mm, 10mm, 13mm) Package Includes: 8 x Pin Centers 1. High quality dowel centers are made of steel for excellent marking performance in solid materials. Therefore, you can use it for both hardwood and softwood. 2. Common Features These dowel centers allow you to align the dowel holes in drilled pieces to accurately mark the drilling location in the board material. 3. Method Simply drill a series of holes, insert the stud centers, and press the board together. The dots on the stud centers will accurately mark the hole locations in the other member. 4. Protection Surface Protection Mark Accurately mark the location of existing holes or dowels on the second board to be joined. 5. Available in four sizes: 6mm, 8mm, 10mm, and 13mm, each size contains two stud centers. Both solid and hollow stud centers are available, and you can choose which one you need.