SINOCMP Universal Doweling Jig Set with 1 Aluminium Dowel Jig, 3 Aligning Clamps, 60 Dowel Pins (20 Each of 6mm, 8mm&10mm Diameter) and 3 Depth Stop Collars Aluminium doweling Jig whit pre-aligned hold guides and steel bushes. Sturdy, lightweight aluminium construction. 3 Aligning clamps: Align jig to accept boards form 12mm to 36mm thick. Sturdy, lightweight luminium construction. 60 dowel pins: fluted for improved glue retention on tight-fitting glued joints. 20 each of 6mm, 8mm&10mm diameter. 3 Depth stop collars for fitment on drill bit to achieve precise drilling depth adjustment to eliminate over drilling. Sturdy metal construction. 8 years warranty for SINOCMP Dowel Jig