This is a "must-have" tool for various projects that require large gauge wiring, like home renovation, building off-grid electrical systems, solar & solar generators, e-bikes, etc. "Hammer" type crimpers struggle to create reliable connections and the majority of Chinese hydraulic crimpers are sold with dies that are not properly sized for AWG. TEMCo crimpers are properly sized for AWG wires and very reliable, based on reviews. The best tool should be able to crimp as large as 4/0 AWG lugs and as small as 6 AWG (or smaller) to be versatile.