The B&B Pipe Jacks are the strongest, most durable product on the market with the most available head options than any other manufacturer and at least a 2:1 safety ratio that is third party tested. The B&B Pipe Jacks have increased stability due to the following properties: oversized square tube legs and braces, a 1.5” Acme rod, increased width, and a unique bottom lock T-handle. The Folding Pipe Jack Stand With Conveyor Roller Head has an adjustment height from 29-44” and a weight capacity of 500 lbs.