Zareba, 25 Count, 2-3 Gritted Crimping Sleeve, Provides Superior Wire Gripping For Strong Splices, Quickly Splice Wire, 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, Use With 12-1/2 Gauge Wire, Crimping Tool Is Required.