Thomas & Betts, RC863 Yes Ring Terminal

The ABB RC863 are nylon insulated large ring terminal. Self-insulated with high dielectric-strength nylon sleeves. An inner bronze insulation grip sleeve lengthens the flexing radius of the conductor and eliminates conductor creep. The wire range is 12-10 AWG. The length 1.00 inches, width 0.37 inches, maximum insulation 0.210 inches.

Bolt hole size 8
Material is tin plated copper with yellow insulation