Precision ground for quick, easy sharpening of chain saw blades. going for sharpening chain saws High working efficiency, perfect grinding effect and long using life. Basically replace with handle small grinding wheel, and no dust pollution. Convenient to grind, simple to use, safe and reliable. Widely used in precision polishing technology and burring, seam edge grinding process, and the grinding force is 5 to 10 times higher than general grinding tool Colour:Blue+silver Material:Blue corundum Package Contents: 100 x polishing heads (with storage box) 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.