Tylaska TFB-20 Cerberus Rigging Block

The Tylaska TFB-20 Cerberus is a machined, low-friction rigging block for arborists who want a rigging point with no moving parts. It gives the lowering line a smooth bearing surface so the rope and the tree take less wear than in a natural crotch.

What the Cerberus does

Tylaska is known for machined low-friction rings and fittings that started in sailing hardware and moved into tree work. The Cerberus TFB-20 applies that approach to a rigging block: hang it on a sling at the rigging point, run the lowering line through it, and let the groundie take the load at a lowering device.

A low-friction device sits between a pulley and a natural crotch. There are no bearings or sheaves, so it tolerates grit and sap well, and it is lighter than many blocks of similar size. The trade-off is more friction than a true pulley, which can help a groundie control a load but means more effort when hauling.

Many climbers also use low-friction devices for redirects and for small speedlines or retrievable setups, where a clean, snag-free surface matters more than raw efficiency. Because the device is a single machined piece, there are fewer things to check, but the rope-bearing surface still needs to stay smooth.

Using it safely

Pick a sling and connector rated for the loads you plan to put on the system, and confirm rope diameter compatibility with the manufacturer before you buy. Compare it with other rigging rings and hardware to see which style suits your work.

Check the rope-bearing surface for burrs, grooves, or rough spots that could damage rope, and retire the device if it is cracked or deformed. Rig only within the rated strength of every component in the system, inspect gear before each job, and make sure the crew is trained in rigging practice under ANSI Z133 and the manufacturer's instructions.