The Ridgid Roller Head High Pipe Support features rollers to center and rotate the pipe. The locking ring on the support allows for quick and easy height adjustments. The support is ideal for use with threading machines, roll grooving and other pipe working applications. ADDITIONAL SPECIFICATIONS: Model No. RJ-99; Height Adjustment Low-High: 32" - 55"; Max Pipe Capacity: 12"; Max Weight Capacity: 1,000 lbs.; Weight: 27 lbs.