This round ended feather key set is made of high quality A3 carbon steel, rust-proof, wear-resistant, accurate, and smooth. The plastic box makes it easy to recognize and storage your parallel keys. It is suitable for fastening many different equipments. Features: Combine a mix size of 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, 30mm, satisfy your different needs. Rust-proof, wear-resistant, and high expanding ability. 140pcs are enough for multiple choices. Equipped with a plastic box, you can classify these feather keys in an organized manner, more convenient to carry and take out. Accurate process, smooth surface, without blur. Mainly used to fasten the equipments disassembled frequently. Specification: Material: A3 Carbon Steel Weight: 400g Contents: 3*3*8mm 10PCS 3*3*10mm 10PCS 3*3*12mm 10PCS 3*3*16mm 10PCS 4*4*10mm 10PCS 4*4*12mm 10PCS 4*4*16mm 10PCS 4*4*20mm 10PCS 5*5*12mm 10PCS 5*5*16mm 10PCS 5*5*20mm 10PCS 5*5*25mm 10PCS 6*6*16mm 5PCS 6*6*20mm 5PCS 6*6*25mm 5PCS 6*6*30mm 5PCS Package List: 1 x Box of Round Ended Feather Key(included 140pcs)