Electricians and solar installers, this is a professional-grade grounding connector from Burndy (a top brand in electrical connectors). The model is GAR3904BU, and it's a pipe clamp style. You use it to attach a grounding wire (a \grounding electrode conductor\) to a metal water pipe or other grounded metal structure.

It's designed to fit a wide range of wire sizes, from 4 AWG all the way up to 4/0 AWG (that's pretty thick cable). It's made from a copper alloy for excellent conductivity and corrosion resistance. This is a brand new, single clamp in its original packaging.

This is a crucial component for any proper electrical grounding system, required by electrical code in many installations. If you're doing a service upgrade, installing a generator, or setting up a solar array, you'll likely need one of these. Trust Burndy for a reliable, code-compliant connection.