Heavy Duty Lugs - 4 Gauge Wire - 5/16" Post - 25-PackCable Gauge: 4Screw Size: 5/16" ANCOR Marine Grade lugs are manufactured from heavy duty annealed tinned copper, providing for maximum current flow 100% tin plated copper resists corrosion from salt and moisture Seamless barrel design allows for maximum strength when crimped Closed end design seals out moisture so cables stay dry and corrosion free WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov. Specifications: Gauge: 4 AWG Type: Lugs Post Size: 5/16" Package Qty: 25 Heat Shrink: No Box Dimensions: 1"H x 1"W x 3"L WT: 0.5 lbs UPC: 091887243062 Quick Guide (pdf)