Crosby® G100 1/4” DOS Chain Slings are Grade 100 Alloy Steel Double Leg Chain Slings with Master Link and Sling Hooks. DOS chain slings are made with proof tested Crosby G100 components and chain. The identification tag found on each sling contains the following information: grade, chain size, reach, sling type, WLL and serial number. Warning: Read and understand Crosby specifications and instructions before using Crosby Alloy Steel Chain Slings. Failure to read and understand those instructions may cause death or serious injury. RFID tagging is available for an extra charge.