12pcs Cylindrical Wool Grinding Polishing Head Buffing Wheel 3mm Shank for Rotary Tool (3mm) Features: Polishing head is made of wool felt which is wear resistance, have good polishing effect. It is an efficient polishing tool in small area of rust deburring and surface polishing. Grinding head with different kinds of sizes, meet your different needs. Used for all kinds of mold, glass, medical equipment, gold and silver jewelry, metal, non-metallic surfaces, grooves and cone mirror polishing. Suitable for pneumatic, electric rotary grinding machine. Specification: Material: Wool & Iron Weight: Approx. 24~47g/0.8~1.7oz Shank Diameter: 3mm Package List: Model Specification Quantity #01 3*3mm 12pcs #02 3*4mm 12pcs #03 3*5mm 12pcs #04 3*6mm 12pcs #05 3*8mm 12pcs #06 3*10mm 12pcs #07 3*12mm 12pcs #08 3*14mm 10pcs #09 3*16mm 10pcs #10 3*18mm 8pcs #11 3*20mm 8pcs Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Please follow when polishing mill in one direction, not back and forth grinding, so the best and most durable.