Material:PVC,with spring inside Usage:Peel wire coat,insert the wire in,then tighten. Feature: Appearance has twist wings,to m Item No.H(mm)W(mm)Inside Dia.DWire RangeColorPacking(mm)WS-HP1125.4181018-10AWGYellow100PCSWS-HP1227.717.81022-8AWGTanWS-HP1330.523.11218-8AWGRedWS-HP1532.625.514.618-8AWGGrayWS-HP1739.531.717.814-6AWGBlue Double Wings Screw-on Connectors WS-HP12