... .Most competitive price. 4.Professional rubber manufacturer. Details about o ring tool : Materials Comply with ROHS, NBR, Silicone (VMQ), EPDM, Viton, etc ... optimization.8. OEM and ODM are highly welcomed, V ring, D ring, X ring are all available.Our advantages:1. Strong QC and ... current molds for all kinds of o ring, AS568, JS, Metric and BS o rings are all available. Good quality o ring tool