Zareba, 25 Count, 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 & In-Liner Strainer Attachment, For Use With 12.5 To 13.5 Gauge Wire, Crimping Tool Required Not Included.