Your electrical connection overheats, the terminal corrodes, or the wire pulls out of a butt splice - and you're chasing a failing connection somewhere inside conduit you already closed up. Low-quality mechanical lugs are one of the most common sources of electrical call-backs, and using the wrong size or material is how you get there. This 10-14 AWG copper mechanical lug gives you a set-screw connection that grips the wire firmly without requiring a crimper - you can terminate in the field with basic hand tools and get a connection that holds through thermal cycling and vibration. Copper construction means conductivity matches the wire, so you don't get a hot spot at the connection point. The 10-14 AWG range covers the most common residential and light commercial branch circuit wire sizes Stocked at Crofton Lumber and Akron Lumber.