Gibraltar Chrome Tom Arm with L Rod & ball design.  Works well with Gretch, Slingerland, Ludwig and others.  Lower shaft measures 5 1/4" in length, diameter is 7/8", the upper arm is 5 1/4" long.  The knurled upper arm diameter is 7/16" thick, just under 1/2".  (see photo) No memory lock included.  Chrome is in "like new" condition.  Last one.