Rubber Screw Protectors We are the leader manufacturer of rubber screw protectors,because we can supply all sizes you need. Item vinyl caps Insulation Resistance DC 500V, Insulation Resistance R≥200MΩ Appearance clean,no dirty dot Dielectric Withstand Voltage Test AC 2500V/Min (5mA)  No  Breakdown Aging Test 168Hrs at 136°C without aging Flammability Standard UL 94 V-0 …