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)