The shape corresponds to the corners of the small Carbon steel cutting wheel with 100mm / 3.9 inch diameter, this cutting wheel is delivered with the coating boundary. Suitable for cutting, grinding and polishing hard materials such as marble, , glass, ceramics and more with this cutting wheel. Great tool for DIY, craft work, jewelry making or forge money Come with layered border Diameter of the hole: . 20 mm Disc: . 1 mm Material: Carbon steel Coating: Titanium Color: golden Package includes: 1 x diamond cutting blade Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.