1.O-Ring Kit ,O-ring box,Material: NBR / BR / Silicone / Viton / HNBR / EPDM / CR O-Ring kit ,O-ring box,both metric and inch we ... o-ring kit,O-ring box .Size: Metric / inch 180PC O-ring kit, 225pc o-ring kit, 300PC O-ring kit, 382pc o-ring kit, 386pc o ... -ring kit, 404pc O-ring kit, 407pc ...