Features: * 100% brand new and high quality * Made of high quality material, durable and practical to use * Saw blade reduction ring, inner hole conversion ring, cutting disc inner hole reduction ring, easy to use with saw blade rail and electric grinder. * Can be used in conjunction with rotary tools to cut metal, wood, plastic, etc. * For adjustment and conversion, alloy saw blades and other mounting holes become smaller. Suitable for saw, marble blade inner hole conversion, angle grinder, cutting machine Specifications: * Material: iron * Color: Silver (As pictures show) Main specifications: Inner diameter OD (in mm) 25.4-16 22-16 25.4-20 20-16 22-20 30-25.4 25.4-22 *High hardness, not easy to break. Good cutting effect, flat and smooth cuts. Package Content: 1 Pack x Placemat (1 Pack = 10 Pcs) Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.