Closed Type Pulley Double Sheave Eith Eye-LG RIGGING®
The material we use is steel and the surface finish is galvanized or painted.
So the advantage of a thick zinc layer is high corrosion resistance.
This block is only one size 8 inches with WLL 4T. The rope size could be up to 24MM, usually used in Lifting.
Pulley and Block are common lifting mechanisms used for rigging and can be used with Wire rope Nylon rope or Chain.
The more wheels you have, and the more times you loop the rope around them, the more you can lift.