Durston Mfg. 1/4" (No. RLR4) and 3/8" (No. RLR6) Reversible Roto-Lock Ratchets have a 144-tooth ratcheting action that requires as little as a 2.5-degree sweep on the reverse stroke. The locking swivel head rotates 180 degrees and locks in 15 different positions. Sockets and attachments are securely locked by a quick-release button.