Columbia Throttle Box bullnose roller Air Flow - No air

Air Flow - No air flow control — vent remains open at all times

Split wheel design - Harden stainless steel & tough Delrin wheels eliminate drag on tape

With the exception of the flat boxes

while keeping it aligned in the corner

Low Center Of Gravity No-Flip Design

Columbia Throttle Box bullnose roller Air Flow - No airThe Throttle Box is another great product of ours that offers years of great performance. All billet construction with a threaded stainless steel ball, this Corner Box looks and operates seamlessly. All our Corner Boxes now come standard with automatic capabilities, making pushing the box at least 50% easier than standard boxes. The new springs have adjustable tensions and greatly reduce the occurence of air pockets while running. The Throttle Box