Petzl JAG Double Pulley

The Petzl JAG is a double pulley with a becket attachment point, built for setting up compact mechanical advantage systems. Arborists use it for tensioning lines, small pulls and haul setups where a big fiddle block would be overkill.

How tree crews use it

The JAG is small enough to live in a gear bag and quick to set up. Paired with another pulley and a length of rope, it makes a compact system for tensioning a speedline, snugging a guy line, or putting a controlled pull on a small leader before a cut.

The becket gives you a place to tie off the rope end or attach a second pulley, which is how you build more advantage from a small kit. Compare it with heavier blocks in our mechanical advantage range.

Limits and care

The JAG is a small pulley. It is not a substitute for a rigging block when you are catching and lowering wood, because the dynamic forces in rigging are far higher than a steady pull. Use it for controlled hauling and tensioning within Petzl's ratings.

Check the sheaves turn freely and the side plates are not cracked or bent, and keep it clean of sap and grit. Rigging gear is for moving wood, not for life support. Match every component to the load with a working margin, follow the manufacturer's ratings and ANSI Z133, and make sure the crew is trained in rigging before relying on it. Note when each piece went into service, so worn gear gets retired on time instead of living on the truck for years.