These rings are lighter and smaller than a conventional pulley block

and heat resistant

Fits the Following Models:

SpeeCo Idler Sprocket 1/2" for Chain Size 40-41 S80441700

With the addition of a stiff tether

US Rigging - LYT1607 - Adjustable Safety Lanyard Double Braid Lanyard These rings are lighter andUS Rigging Adjustable Safety Lanyards Constructed from three strand polyester or double braided polyester nylon line. A non complicated basic lanyard. A solid secondary tool for safety while tied in using climbing spurs. Forged alloy steel, double locking safety snap hooks tested and rated at 23 kN (5,000 lbs) 1 2 diameter Length: 4 7' Hand spliced eyes Shrink tubing forms tapered cover over tails