to Use: Our diamond wheels are titanium plated, which means that the service life of these drills is much longer than that of other wheels without titanium plating. Besides, the diamond particles on the drill bit are polished finely and evenly, hard and not easy to wear Fast Result: This is a powerful sharpening tool with high hardness diamond chainsaw, so you can grind things quickly. Eliminates the need for a hand mill. Wide Application: There are three sizes in our set, which are suitable for different applications. You can use it for metal polishing, chain saws, wood, and more. Easy to Install: This tool is easy to install and can be changed in just two steps. The titanium-coated file is harder and more wear-resistant, so you don't have to replace it frequently. Suitable Type: 5/32 inch wheels for electric chain saw and other small blades, 3/16 inch wheels for small oil chain saw, 7/32 inch wheels for large oil chain saw. Color: Silver Material: Emery Package Contents: 18 x Sander (4mm, 4.8mm, 5.5mm, 6 pcs each size) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm.