The Petzl swivels prevent the rope or load from twisting when the load is turning. That feature is a must have to relieve load stress on your rigging system.
Mounted on sealed ball bearings.
SWIVEL S: compact, designed for one-person loads, 5175 lbs. / 23kN
SWIVEL L: NFPA G and designed for two-person loads, 8100 lbs. / 36 kN.
Plus, up to 3 connectors can be attached in each of the swivel.