The length of the mobile arm from the base to the hinge is about 24 inches. The length of the mobile arm from the hinge to the top is about 13.5 inches. The height of the mobile arm from the base to the hook is about 29 inches. Keep in mind that the angle of the arm is in a fixed position (not adjustable)! Additionally, the largest diameter of spindles/crib bars that this mobile arm can attach to is 7/8 inches.
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