G.O.T.H. CHASSIS MODULES - for 1.11" ID section - 28mm Premium speaker holder (flat 2w speaker sold at TCSS, Railmaster, or Solo's Hold). Due to its size, the 28mm speaker needs to be glued to the holder. Holes available for 4-40 threaded rods in order to attach other Chassis Modules available in this store. These holes are compatible between all sizes, so you can mix modules between different sizes according to your saber structure.