The PETOL FLANGE WRENCH was specifically designed for working on threaded flanges and significantly reduces the risk of injuries associated with other methods often being used in the field. Unique features allow the operator to quickly and easily tighten and loosen 1" to 12" threaded flanges. Pins fit easily into the threaded flange bolt holes. Specifications: Threaded Flange Sizes: 1" - 12" Pin Diameters: 1/2", 5/8" Length (end to end): 18" Weight: 4-1/2 lbs.