5/16" x 20' Domestic Single Leg Chain Sling with Crosby Sling & Foundry Hooks - Grade 100 Drum Lifting Clamps they define design factor as

they define design factor as the "ratio of the breaking strength to the working load limit

Complete your tie down system with strap protection

This sling measures 6' length bearing point to bearing point and features self-locking hook and self-locking hook end fittings

and a folding handle keeps the mechanism out of the way after the load is secure

This sling measures 3' length bearing point to bearing point and features oblong master links

5/16" x 20' Domestic Single Leg Chain Sling with Crosby Sling & Foundry Hooks - Grade 100 Drum Lifting Clamps they define design factor asSingle Leg Chain Sling 5 16" x 20' This 5 16" single chain sling is constructed from Grade 100 domestic alloy steel and Crosby components including master links, coupling links, and end hardware. These chain slings are made and assembled in the USA for a quality, domestic product you can trust. This sling measures made to order length bearing point to bearing point. Additional Single Leg Chain Slings For a more versatile option, check out our