Gibraltar Chrome Stack Right Angle Clamp

Gibraltar SC-GCSRA 1.5" Chrome Adjustable 3-Way Inline Drum Rack Clamp

Designed to connect two horizontal rack bars inline at 90 degrees to a common vertical rack bar or leg. Once attached, the two sides of the clamp can adjust through 90 degrees so you can wrap your setup as tightly as you need while increasing the playable area.