OsznmmgBattery Cable Lug Crimping Tool Set +60PCS Copper Ring Terminals for Crimping 6-50mm² (AWG 8-1/0) Wires and Cables Heavy Duty Hand Electrician's Pliers with Thick Reinforced Metal Plate

I like how heavy duty these crimps seem, it gives me the impression they will be in my toolbox for the rest of my days. They are all metal apart from the rubber hand grips and some plastic inserts inside the handles.I find adjustment for different size terminals is super easy with the sprung pins that position the rotating jaws. They take a bit of effort in use but have good leverage and they crimp well even up to AWG 1. The jaws are a bit loose but self centre on the terminals fine.Overall I can't really fault them, they work great.

Very sturdy but not being a tradesman I struggled to work out how to use them , no instructions included had to go online to find out how to open then!!!

Typical crimping tools only work for smaller wire sizes, up to maybe 14AWG max. For anything larger you need a much beefier tool, like this one.The jaws are adjustable for a range of sizes. Simply select the size you need and insert the terminal and wire and squeeze. I found that crimping to a slightly larger size first then to final size produces the best results.