4" Stroke Jumbo Rivet Buster. Features a Boyer spool valve to deliver smooth power in any operating position. Features a non-ejectable piston. Ideal for cutting large rivets, concrete demolition, and heavy-duty chipping work in maintenance and construction. Equipped with 2101, 2103, 2104, 2194 & 2190-2.557 accessories to accept 2000 series jumbo chisels.