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【Material】This round ended feather key set is made of carbon steel, which is rust-proof, wear-resistant, and high expansion ability to ensure a long lasting use 【16 Sizes】Total 142 pcs parallel keys contain 16 sizes of key stocks, come with mixed sizes of 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, 30mm, 35mm, which are can be applied to various occasions 【Workmanship】The round ended feather keys kit has undergone an accurate process, so they have smooth surface without burrs, which feel smooth and won’t hurt your fingers during working process 【Wide Application】Mainly used in machine tools, for fastening equipment that is frequently disassembled, and it fits into a mating key-way to transmit torque between shafts and hubs or bushings 【Easy To Install】The flat key is semi-round chamfers at both ends, integrally formed, easy to insert and install, and you can easily install it