Hexagon reducer bush (3-1/8" across flats to 2-9/16" across flats)
 
Outside Hex Size: 3-1/8"
Inside Hex Size: 2-9/16"
 
These Hex Reducer Bushings are used in hydraulic torque wrenches when you want to use an existing 3-1/8" hex link to tighten or loosen a 2-9/16" nut. These will fit in all hydraulic torque wrenches and multiple sizes are available.