LUDWIG (Conn-Selmer) LAC251CH Ludwig LAC251CH Atlas Series Classic Cymbal Arm Ludwig LAC251CH Atlas Series Classic Cymbal ArmThe ATLAS Classic Cymbal Arm is a self-attaching cymbal mounting arm that has a telescoping Aerodyne Tilter. The ratcheted attachment clamp fits securely to any 12.7mm rod, tom arm, cymbal boom or floor tom leg for easy, secure cymbal placement.