Mountain 4044 Hammer Set Piston hammer - the extended head allows the hammer to pass the deck of the engine block for piston installation Piston hammer provides dead blow action and absorbs shock, reducing the chance of injury Complete range for a wide variety of tasks Soft face won't mar surface Includes - 1/2 lbs. Dead blow hammer, 1 lbs. Dead blow hammer, 2 lbs. Dead blow hammer, 32 oz piston hammer