Features: 1.Total of 740pcs sealing O?rings, including 24 specifications, meet your different needs. 2.Made of premium nitrile rubber, it has strong resistance to oil, abrasion and heat. 3.Used for sealing between parts, suitable for machine tools, automobiles, sanitary ware, etc. 4.Perfect to use to prevent leaks while working with plumbing, hydraulics, air and gas connections. 5.Manufactured to meet standard specification, strictly follow factory quality control. Specification: Item Type: O-Rings Material: Nitrile Rubber Quantity: 740pcs Including: 6 x 1.5mm/0.24 x 0.06in (50pcs) 6.5 x 1.5mm/0.26 x 0.06in (50pcs) 7 x 1.5mm/0.28 x 0.06in (50pcs) 8 x 1.5mm/0.31 x 0.06in (50pcs) 9 x 1.5mm/0.35 x 0.06in (50pcs) 10 x 1.5mm/0.39 x 0.06in (50pcs) 11 x 1.5mm/0.43 x 0.06in (50pcs) 12 x 1.5mm/0.47 x 0.06in (50pcs) 13 x 1.5mm/0.51 x 0.06in (50pcs) 14 x 1.5mm/0.55 x 0.06in (30pcs) 15 x 1.5mm/0.59 x 0.06in (30pcs) 16 x 1.5mm/0.63 x 0.06in (30pcs) 17 x 2.4mm/0.67 x 0.09in (20pcs) 18 x 2.4mm/0.71 x 0.09in (20pcs) 19 x 2.4mm/0.75 x 0.09in (20pcs) 20 x 2.4mm/0.79 x 0.09in (20pcs 21 x 2.4mm/0.83 x 0.09in (20pcs) 22 x 2.4mm/0.87 x 0.09in (20pcs) 23 x 2.4mm/0.91 x 0.09in (20pcs) 24 x 2.4mm/0.94 x 0.09in (20pcs) 25 x 3.1mm/0.98 x 0.12in (10pcs) 26 x 3.1mm/1.02 x 0.12in (10pcs) 27 x 3.1mm/1.06 x 0.12in (10pcs) 28 x 3.1mm/1.1 x 0.12in (10pcs) Application: Used to seal between parts, widely used in machine tools, automobiles, sanitary ware, agricultural machinery, and various instruments and measuring equipment. PackageList: 1 Box of O-Rings (740pcs)