Ilsco SureCrimp Copper Compression Lugs, Standard barrel, 1-hole, w/sight hole, Wire size: 250 kcmil / 4/0 FLEX, Bolt/Stud Size: 1/2, 10pk;Rated up to 35kV at 90°C (proper high voltage spacing and insulation techniques required) ;Chamfered wire entry provides ease of installation;UL467 Listed 8AWG to 500kcmil,UL468A/B Listed 600kcmil to 750kcmil;Manufactured from high strength seamless copper tubing;Electro-tin plated;Color coded;UL listed and CSA certified with ILSCO and major competitor’s compression tools such as Panduit, Burndy, T&B and more. ;Ilsco color code: Yellow, Die index: I-62 Panduit color code: Yellow, Die index: P62 Burndy color code: Yellow, Die index: 16 T&B color code: Yellow, Die index: 60;Rated for Class B & C Building Wire Rated for Class G, H & I Flex Wire Rated for Class K & M Weld Wire Rated for Class DLO Locomotive Wire;UL File # E6207;