Four sizes: 29", 35", 45", 70" (74cm/89cm/114cm/178cm)
Oversized easy to maintain rollers (with a cloth & water)
Wheels adjust up/down, in/out with turn of a screw
No magnets: Easily adjustable rubber bumper cushion each end
No reach over: Dual side controls for friction and lock off break
360-degree turret with locks that may be offset
Dozens of 3/8-16 rigging holes
Positive lock at 90-degrees