Specifications: Material: Stainless steel Mandrel Length: 3mm Head diameter: Approx. 25mm Total length: Approx. 40mm Mainly suitable for deburring, dust, rust, remove the oxide layer, coating, can improve the quality of metal stone, is an important part of the machining process. Ideal for Removing Rust/Corrosions from Any Metal Surfaces (e.g.: Steel, Aluminum, Zinc alloy, Brass, Copper, etc.), especially Precious metals. Perfect Accessories for Jewelers, Locksmiths, Gunsmith, Technicians, Coin Collectors, Archeologist, Students ect. Use: gold and silver jewelery, clocks, glasses and other metal surface polishing.