【PACKING】4Pcs 8-inch diamond file set, which are half round/flat/round/triangular. The material of this file set for metal is diamond coating and carbide steel, which can increase the service life and product strength to a greater extent. Four different types of diamond files can meet your different needs. 【SPECIFICATIONS】 Flat file: total length: 302mm, working length: 165mm, file thickness: 4mm(0.16 inch). Round file: total length: 302mm, working length: 156mm, file thickness: 6mm(1/4 inch). Half round file: total length: 302mm, working length: 165mm, file thickness: 6mm(1/4 inch). Triangle file: total length: 302mm, working length: 175mm, file thickness: 11mm. Grit: Coarse sand 【SUPERIOR PERFORMANCE】This needle file set has good heat dissipation performance, so that the surface of the workpiece will not be blackened, discolored or left behind due to overheating during grinding. There is little noise and dust during grinding, and it will not cause danger due to rust and fall off like a wire brush. The non-slip plastic handle is comfortable to hold. 【SHARP AND WEARABLE 】6 inch metal file diamond coating : Both sides. Cuts into welds and hardened surfaces where other files can't. Diamond alloy files are made of high-strength diamond and high-quality substrate electroplating, which are sharp, wear-resistant, high-strength, possess physical properties, strengthen and wear-resistant properties. Diamond files are most suitable for fine work and can be used for high-speed steel with a hardness of 69. It is especially effective for metals such as stainless steel, titanium metal and high nickel alloys. Widely used in various molds, models, parts, handicrafts and other industries, such as: grinding, polishing, engraving, cutting, correction, etc. of jade, ceramics, glass, crystal, metal, cemented carbide and other parts., Manufacturer: shuqiu