Product Color: Silver Material: A3 steel Surface finish: Chrome plating Type: hollow Quantity: 2 pcs each size 6mm, 8mm, 10mm, 13mm Package Include: 8 x Stud Centers 1. High Quality Dowel centers are made of steel for excellent marking performance on solid materials. You can therefore use it for both hardwood and softwood. 2. Common Features These stud centers allow you to line up stud holes in drilled parts to accurately mark the location of the drill in the joint material. 3. Method Just drill a set of holes, insert the stud centers and press the gasket together. The points on the stud centers will precisely mark the locations of the holes on the other member. 4. Protection Surface protection mark Accurately mark the location of the existing stud holes or pins in the second board to be assembled 5. Available in four sizes 6mm, 8mm, 10mm, 13mm, each size contains two stud centers. There are solid and hollow stud centers, and you can choose which ones you need.