1、For 404 Chains: These sharpener stone bits are mainly used with a hand cranked chain sharpener, suitable for grinding and polishing large chainsaw 404 chains. 2、Diamond Abrasive: These sharpener bits are made of diamond abrasive, which have high hardness and wear resistance, ensuring good polishing and delicate grinding. 3、Convenient Use: These diamond chainsaw sharpener bits are compact and lightweight, easy to install, allowing for polishing and grinding without removing the chain. 4、Applications: These diamond burr tools are widely used for grinding and polishing workpieces, jadestone, ceramics, glass, hard alloy, etc., has a wide range of applications. 5、Specifications: Includes 5pcs grinding bits, standard M5 thread size, easy to install and replace, equipped with nuts and wrench to ensure convenient operation. Item Type: Chainsaw Sharpening Stone Bit Material: Diamond Blade Diameter: Approx. 5.5mm / 0.22in Blade Length: Approx. 17mm / 0.67in Handle Diameter: Approx. 6mm / 0.24in Thread Diameter: M5 Total Length: Approx. 48mm / 1.9in Applicable Saw Chain: Large Oil Chainsaw 404 Chain 5 x Sharpening Stone Bits 2 x Nuts 1 x Wrench