Zareba HTGCS4525 Gritted Crimping Sleeve 4-5 Provides superior wire-gripping for strong splices Allows for quick splicing of wires, in-line strainers or loops at end posts Use 3 sleeves per splice for wire, 2 sleeves for end post loops and in-liner strainer attachment For use with 12-1/2 TO 13-1/2 gauge wire Crimping tool required (not included)