Crosby® A-1339 1/4" Grade 100 Clevis Sling Hook - 1049112Crosby A 1339 Grade 100 Clevis Sling Hook The Crosby A 1339 Grade 100 Clevis Sling Hook is designed specifically for chain sling assemblies used in demanding lifting and rigging applications. Engineered for use with Grade 100 or Grade 80 chain, these hooks feature an extra large throat opening that allows for easier engagement with loads, attachment points, and lifting hardware. Manufactured to Crosby's industry leading standards, the A 1339 clevis