170pcs good sealing performance 70 durometer o-rings with 1 pick up tool This O-ring kit contains the 12 popular AS568 sizes used in scuba diving gear It is used in scuba applications with Nitrox because of its excellent resistence to oxygen All o-rings and pick up tool are packed in a plastic box with compartments Great repair replacement accessories for scuba diving gear Specification: Material: Rubber Color: Black (Quantity) AS568 Size (I.D.), Typical Use (15pcs) -003 (1/16"), High Pressure Hose/Swivel Seal (15pcs) -010 (1/4"), Low Pressure Hose/2nd Stage Reg/Cyl Valve Stem (15pcs) -011 (5/16"), Low Pressure Port/Hose,Hose Adapters (15pcs) -012 (3/8"), High Pressure Port/Hose,Gauge Hose (15pcs) -013 (7/16"), Large Low Pressure Port/Hose,Piston Seat Seal (15pcs) -014 (1/2"), Standard Yoke/Tank Regulator (15pcs) -015 (9/16"), High Pressure Hose/Swivel Seal (15pcs) -022 (1"), Regulator Piston Ring/Body Plug Seal (15pcs) -111 (7/16"), Small DIN Regulator Valve (15pcs) -112 (1/2"), Standard DIN Regulator Valve (10pcs) -116 (3/4"), Small Tank Neck, 3500 Cylinders (10pcs) -214 (1"), Large Tank Neck Package Includes: 170 Pieces Scuba Diving O-ring Kit Note: Due to the differences between different monitors, the picture may not reflect the actual color. There is 2-3% difference according to manual measurement, please check the size carefully before you buy the item. Thanks!