500 PCS / Lot Nitrile Rubber O-ring Black NBR CS 1.2mm OD5/6/8/10/12/13/14/15/16/17/18/19/20*1.2mm O Ring Gasket Oil Waterproof

500 PCS / Lot Nitrile Rubber O-ring Black NBR CS 1.2mm OD5/6/8/10/12/13/14/15/16/17/18/19/20*1.2mm O Ring Gasket Oil Waterproof