Short, flat version with ratchet Ratchet facilitates tightening of straight and elbow compression fittings underneath radiators Head end socket for 1/2” extension. The extension is used as a handle and also provides higher torque Side socket for 1/2” extension for working with the ratchet in front of the radiator Socket for no. 3801 combination stepped key 3/4” radiator valve nipples DBGM (= German Utility Patent) DBGM (German utility patent)