Decent quality keeper similar in design to those found on many '80s-present Marshall guitar amplifiers. Top piece 1.5" diameter, two springs are approx. 1.29" long, mounts to the tube socket mounting screws by two small "L" shaped clips. Many of you have asked us for a spring loaded tube retainer that'll work with the shorger octal based tubes. Here it is! As depicted this retainer fits GZ34, 6SN7GT, some 5881/6L6WGB and similar relatively short octal based tubes. Brand New. Made In China.