100% Brand New And High Quality Shape: Cylindrical Diameter: 4mm (suitable for chainsaw small 8 chains) 4.8mm (suitable for small chain saw 325, large 8 chain) 5mm (suitable for large chain saw 404 chain) Shank Diameter: 3mm Material: Chrome steel jade Suitable for: Electric grinder, lithium electric grinder Mesh Number: about 120-150 mesh Product Usage: It is mostly used for grinding chainsaw chains, and also suitable for grinding and polishing jade.mill. After polishing, the jade carving workpiece is finely ground and the machining accuracy and efficiency are farHigher than traditional oilstone polishing Package Included: Grinding Wheel Grinding Head Note: 1. Due to the different monitor and lighting effect, the actual color of the item may be slightly different from the color shown on the pictures. 2. Please allow 1-3cm error due to manual measurement. (1 inch = 2.54 cm) Thanks for your support :)