ISC Arborist Block 20mm (3/4") Bags - Rope & Gear Ball bearings: no

Ball bearings: no

Open gate: 7 kN

and by the end you'll have a really clear idea on what gear you need and how to use it

• Pre lubricated sintered bronze bearings for ultra smooth operation

they have made a heap of other design improvements too

ISC Arborist Block 20mm (3/4") Bags - Rope & Gear Ball bearings: noISC Alloy Arborist Block 20mm (3 4") The updated RP055 from ISC is a 3 4" capacity spring block perfect for the working arborist. Compact design and the unique upper sheave opens and closes and secures easily. Eliminates the chance of dropping a sheave. The rope friendly rounded side plates are thick aluminum with a blue powder coating to enhance the life of the block. MBS: 150KN WLL: 30KN Pulley wheel colour Green Anchor wheel colour Red Body