Made from 100% Tinned Copper for Maximum Conductivity,Heavy duty Electrical wire Lugs are great for inverters, Battery and automotive applications. | Heavy Duty Construction for Enhanced High Temperature Durability | Including 10 sizes.8*5/16(5PCS),6*1/4(5PCS),6*5/16(5PCS),6*3/8(5PCS),4*5/16(5PCS),4*3/8(5PCS),2*5/16(5PCS),2*3/8(5PCS),1/0*5/16(5PCS),1/0*3/8(5PCS).Close End Pad Seals Out Moisture Keeping Cables Dry | Can be Crimped or Soldered | UL Tested & Approved