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Product Description Material : Wool. Shank Diameter : 3mm/ 1/8Inch. Head Diameter: 22mm/ 7/8 Inch. Shape: Round. Package Included:20PCS. Product Features: Mainly used to remove burr, dust, rust, oxide layer and coating, which can improve the quality of metal stone and is an important part of machining process.It is a necessary, economical and efficient method.Used for polishing various rough surfaces of wood and metal materials from different angles. Scope of use: polishing various metal surfaces of gold and silver jewelry, watches and glasses, shoushan stone, etc.>