Brass ball catch is constructed of diecast and steel components The drivein ball catch features a 34 x 1316 barrel with a steel ball, spring and strike plate This ball catch is designed to provide a springloaded latching system where a standard door knob latch bolt is not required andor desired These drivein ball catch latch devices remain concealed from view once installed, and they are generally used on a pair of swinging double doors with dummy knob hardware Carded