At iStudio Projects, our iSP Loft Block Series B 7-Groove Underhung is a high-capacity multi-groove theatrical rigging block designed for large pipe battens requiring seven simultaneous lift lines. Built with the same rugged sealed bearing sheave assembly and welded heavy-steel housing as all Series B blocks, the 7-groove delivers the broad lift-line distribution needed for long, heavily loaded battens while maintaining the same 875 lb rated line load capacity.