4" Stroke Jumbo Rivet Buster. Features a non-ejectable piston and precision ground spool valve. These busters are smaller than their predecessors however, they deliver a heavy blow. Ideal for overhead work under bridges, parking decks and concrete structures. Perfect for driving large nails in timber construction. Comes equipped with 2101, 2103, 2104, 2194 & 2190-2.400 accessories to accept 2000 series jumbo chisels.