ITEM NAME:8Pcs Woodworking Spacing Ring+Hex Wrench+8x Hollow Dowel Centre Points Pin Description: (Black) Drill limited ring, clamping device, positioner, works with both standard and brad-point bits Setscrew type collar will not damage bits, positively locks anywhere along the bit, hardened and tampered (Silver) Made of A3 chrome plated Using drill bit to align with the round imprinted to make two blocks join perfectly Available for connect two blocks Specification: (Black) Shaft Chuck+Hex Wrench: Material: High Carbon Steel Size: Approx. 3, 4, 5, 6, 8, 10, 12, 16 mm/ 0.12, 0.16, 0.20, 0.24, 0.31, 0.39, 0.47, 0.63 inch (Silver) Dowel Centre Points Pin Set: Material: A3+Chrome plated Dowel joint alignment tool centre point pin set for Approx. 6/8/10/12mm dowel holes (Approx. 0.24/0.31/0.39/0.47 inch) Durable, wear-resistant, corrosion-resistant, necessary for carpentry Very easy to store and maintain Package Includes: 8 Pieces of Drill Bit Depth Stop Collar 1 Piece of Hex Wrench 8 Pieces of Dowel Centre Points Pin.6/8/10/12mm dowel holes. Durable, wear-resistant, corrosion-resistant, necessary for carpentry. (Silver) Dowel Centre Points Pin Set 8 Pieces of Dowel Centre Points Pin. (Black) Shaft Chuck+Hex Wrench.