SCREW ON WIRE CONNECTORS MATERIAL:UL NYLON 66,WITH SPRING INSIDE USAGE:PEEL WIRE COAT,INSERT THE WIRE IN,THEN TIGHTEN SCREW ON WIRE CONNECTORSMATERIAL:UL NYLON 66,WITH SPRING INSIDEUSAGE:PEEL WIRE COAT,INSERT THE WIRE IN,THEN TIGHTENPACKING:100PCS IN POLYBAG+MASTER CARTON. Sell Wire Connector