The TY-350 Arm is an alternative to a gimbal head to provide stability and an improved point of balance for a long telephoto lens mounted on a tripod head. The lens' foot attaches to the Arca-profile horizontal rail of the TY-350 with two 1/4" screws (3/8" adapter included), and can be slid along the slot. The camera mounts via a supplied quick release plate to the clamp; height is adjustable.