Three square openings in one socket – 3/4 in (oversize) fits 1/2 in hardware, 1 in fits 5/8 in hardware and 1-1/8 in fits 3/4 in hardware. Easy to use with rubber gloves with a Secure Lock Quick-Change Adapter that Prevents Unwanted Socket Disconnect – Adapter sold separately under the SS-3AD. Multi-use wing nut and eye bolt type clamp applications: Grounding clamps, Hot line clamps, T-clamps, Underground feed through bushings, Layout arm hardward, Stringing block, Temporary arm insulators, 5/8 in and 3/4 in Eye Nuts, Large hardheads or lags, Large J hooks, Non standard eye nuts on the composite arms and Remove and install pole steps.