EASY ON, EASY OFF RATCHETING POWER. A must have for any professional mechanic. This line wrench makes fast work of troublesome fittings. Using one hand, the wrench head can be opened and closed to completely surround the hex of the fitting. Even a hex that has severe rounded corners can be loosened or tightened because of the unique shape of the wrench head. 360° grip removes even rounded fittings, Ratchet function works in tight spaces, More pressure applied equals tighter grip on nut, Open and close wrench head with one hand, Hinged neck to reach into hard to reach areas.