Description:Features:100% brand new and high quality. Electroplated diamond alloy grinding rod. Fine workmanship, easy grinding, durable. It can be installed on the electric grinder, pneumatic engraving pen. Mainly used for grinding, polishing. Specifications:Product: diamond coated grinding head. Material: Diamond, Steel. Color: silver. Total Length: About 45mm/1.77". Shank dia: 3mm/0.12" Head diameter: 5mm/0.2". Quantity: 5pcsNote:Transition: 1cm=10mm=0.39 inch. Please allow 0-5mm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package Included:5 x Diamond Coated Grinding Head. No retail package