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 grinding things as fast as you can. And the troublesome hand mill. Wide Application: There are three sizes in our set, which are suitable for different sizes. You can use it in metal polishing, chain saws, wood and so on. Easy to Install: The is easy to install, It can be changed in just two steps. Besides, this titanium-coated file is harder and more wear-, so you don't have to change it often. Suitable Type: 5 or 32inch wheels for Electric chain saw and other small blade, 3 or 16inch wheels for small oil chain saw, 7 or 32inch wheels for large oil chain saw. Colour: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 a little different from the real thing. The measurement allowed error is 1-3cm.