The Affinity plugs from Monoprice look to be a similar version to the Sewell Silverbacks. I remember the first time I ever laid hands on the dual screw down banana plug was about 19 years ago. They shipped with Rotel amplifiers and had a plastic (not aluminum) casing to protect the plug. They worked phenomenally well. I've had versions over the years that have appeared to be identical, but most were never built as well as those Rotel plugs were. Not sure who actually manufactured them for Rotel.\n\nThe basic concept of two screws locking the cable in place along with a non-conductive cover that is color coded is a no-brainer to me. At some point I found a company I really liked and I picked up a couple hundred. I've been using them with my clients for the last few years and they work great.\n\nYou just taught me something new: screws to lock the cable in place! Why aren't things like this standard? Thanks for the input.