US60280 and US60290 Big Pipe Cutters are specifically designed to cut large pipes.
Though both are identical in terms of size and specification, US60280 has been optimized for cutting 24" - 48" pipes through the placements of guides and the strap used.
US60290 has been optimized for cutting up t0 72" pipes through different placement of guides and a different strapping system.
Parts are available separately however to allow either saw to cut from 24" to 72" pipes.
