Yamaha HXDBII, Double Bass Clamp for Hex Racks, The double bass clamp is used to horizontally set two tubes at the same height - as in a double-bass configuration. Settings at various angles are possible when used...

Yamaha HXTL23II T-Leg for Hex Racks, Height: 23"

Gibraltar SC-EA-300, Extension Arm with two 360° multi clamp attachments, for Cymbal Arms or Tom Arms or anything others, special Omni Ball System in the middle of the Extension Arm

Pearl DR-008, Drumrack Expansion Unit for Pearl DR-80 Drum Rack