Ercole M13-010A Half Coupler with 12mm thread ⌀ 42-50mm

Avenger C460-1 Clamp Lp Eye Coupler TUV 220Kg Payload 42-52mm Wide 13mm Unthreaded Hole.

The base model of LP eye coupler is a regular clamp to use on pipes or trusses. Made from aluminium alloy, it can be tightened with a wingnut and has a 13mm hole for mounting lights and other accessories. It can support a payload up to 500kg and works on pipes ranging from 48mm to 52mm