I was introduced to WAGO products at work, where we manufacture custom training equipment for airlines and the military. WAGO is a european company that specializes in high-quality, high-reliability electrical connection products. In the past few years, WAGO has begun marketing some of their products to consumers, and their line of LEVER-NUTS connectors is one of those products. These are also sold to industrial and professional customers -- they aren't some cheapie knock-off. These connectors are amazing -- with one device you can reliably join wire from 22 gauge to 12 gauge, solid or stranded, mix-and-match. And the connections are SOLID -- these use a variety of WAGO's "cage-clamp" connector that uses spring-loaded contacts and geometry to create a connection that actually tightens under vibration and tension, rather than loosening and failing like screw connections, wire-nuts and IDC connectors.