Thomas & Betts, RA863 Yes Ring Terminal

The ABB RA863 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 bolt hole of 1/4 inch with wire range 22-16 AWG. The length 0.89 inch, width 0.31 inch, and maximum insulation 0.136 inch.

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