New 3-to-1 Heat Shrink Ring Terminal seachoice 60151 Wire Range 22-18 Fits #8 stud Red : Marine grade heat shrinkable ring terminals. 99.9% Pure copper with brazed seam barrel tin plated. Proprietary nylon/polyolefin 3:1 shrink ratio tubing with adhesive lining provides maximum clarity for wire inspection purposes faster shrink times and improved abrasion resistance. Simply insert the wire crimp and heat shrink for a complete environmental seal.