The boa aluminium strap wrench is the orginial and best strap wrench useful for many jobs including plumbing automotive ac installationmaintence pool pond and oil filtres both strength and flexibility are provided by the braided rubber strap which fits into a slot in the handle of the tool and provides a perfect fit on the work piece provides over 2000lb of pressure without marking the workpiece with a pro use capacity of up to 305mm capacity 10 38in to 305mm 12in