1Machined with external marking points, these dowel centers are used for accurately aligning stock for proper dowel or tenon placement 2Dowel centers are made of premium metal with chromed finish so it is of high hardness and not easy to rust for long service time 3Available in 4 different sizes, which are 6mm, 8mm, 10mm, 12mm, can meet multiple purposes 4Just 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 5There are solid dowel centers and hollow dowel centers selectable 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 premium metal with chromed finish so it is of high hardness and not easy to rust for long service time. Available in 4 different sizes, which are 6mm, 8mm, 10mm, 12mm, can meet multiple purposes. 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. There are solid dowel centers and hollow dowel centers selectable. Specifications: Material: Stainless steel Bottom Diameter: 6mm, 8mm, 10mm, 12mm Quantity: 8pcs(each size comes with 2 pieces) Weight: Approx. 34~57g Package Includes: 8 * Dowel Centers Note: Please allow small size error due to manual measurement. Thanks for your understanding.