Features: Machined with external marking points, these dowel centers are used for accurately aligning stock for proper dowel or tenon placement. Dowel centers are made of steel so you can use this for hard wood as well as soft wood. There are solid dowel centers and hollow ones and you can choose the ones you need. Available in four sizes, 6mm, 8mm, 10mm, 13mm, the set contains two dowel centers of each size. Just drill one set of holes, slip in the dowel centers and press the joint together. The points on the dowel centers will precisely mark the hole locations on the other member. Specifications: Material: A3 steel Surface Finishing: Chrome plating Type: Solid, Hollow(Optional) Size: 6mm, 8mm, 10mm, 13mm Quantity: 2 pcs each size Package Includes: 8 x Dowel Centers.