The American Autowire Crimper Tool Set includes botht the single and double crimper tools from American Autowire. This set is used for F-type terminals included in Classic Update and Universal harnesses made by American Autowire. The single crimp tool works with wire sizes ranging from 20 gauge to 14 gauge. The double crimp tool works with wire sizes ranging from 10 gauge to 18 gauge, or terminals requiring a two wire connection. This set includes both tools, giving you everything you need to uinstall your American Autowire wiring harness.