REDIslvboss is a 2" reducer sleeve to be used with a 3 1/8" barrel. This sleeve will reduce the inside diameter of the 3 1/8" barrel down to a 2" inside diameter for more efficient driving of T-posts and other smaller posts with your 3 1/8" barrel REDI Driver. 2" reducer sleeve to be used with 3 1/8" barrel REDI Driver. Friction fits up into the 3" barrel to reduce the driver’s ID to 2". Use to drive T-posts & fence posts under 2" OD.