KWB 3/8" Clevis Self-Locking Hook - Grade 100KWB Grade 100 Clevis Self Locking Hook The KWB Grade 100 Clevis Self Locking Hook is engineered for demanding overhead lifting and rigging applications where maximum load security is required. Manufactured by KWB, a Pewag company, these premium European made Grade 100 fittings combine exceptional strength with an advanced self locking mechanism that automatically engages when a load is applied. Unlike standard stamped safety latches, the durable self