1 in (28 mm)

To use with Type III life jackets: With the shackle connecting the carabiner and leash

while being quick to install or remove to meet the demands of the job

Very good penetration in ice:

SMC Apex 1.5″ Swivel Pulley Rigging Plate 1 in (28 mm)The Apex Swivel Pulley offers both easy one handed operation and unmatched security. The Apex is a mid line attachable pulley that secures the rope using a low profile, patented, triple action lock mechanism that can easily be opened with one hand. This lock is operated by three distinct actions: pivot the lock button, depress it, then swing open the side plate. Simply closing the side plate re engages the lock mechanism and solidly secures the rope.