3 BBT fully insulated 30 amp 12 circuit safety blocks. These take wire sizes from 16 to 10 gauge & they measure 6" long X 7/8" wide. These handy blocks can be easily cut to any size you need and they don't require wire terminals or covers & are very safe & easy to use, just insert wires & tighten the screws, the connections are always protected. The mounting holes are every 3/8". Our price includes free super fast next day 1st class shipping in the USA, a money back guarantee & great customer service. Thanks for looking, Capt. Bob