G.O.T.H. CHASSIS MODULES - for 1.12" ID section - 20mm Bass speaker holder (sold by TCSS). 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. The 4-40 rods can pass all the way through this module, allowing this module to be located anywhere in the chassis structure. Also note that the speaker can face either way on this module. There is room for wires to pass through as well.