This chainsaw sharpening kit for use with rotary tool is a fast and easy way to sharpen dull, slow cutting chainsaws Ideal to sharpen multiple, different sized chains on chainsaw for increasing the life span of your chainsaw The included grinding stones come in 4 differnet sizes to best match the chains of your chainsaw Grinding depth up to 30 mm Included: 1x sharpening angle guide attachment, 1x adjustment gauge, 4x chainsaw sharpening grinding stones, Weight: 6.25E-4 pounds, Manufacturer: Bosch