Snap-on's Quick Release Ratchets patented design includes high-tech seals and special O-rings to seal in permanent lubrication and seal out dust, dirt, moisture and other contaminants, for smooth-running ratchets without the responsibility of routine maintenance. Quick Release Ratchets are available in 1/4", 3/8" and 1/2" sizes, and feature a push-button release in the center of the square drive for easy, one-handed socket removal.