AIR NEEDLE SCALER SHORT BARREL PISTOLSTYLE 19 X 3MM X 140MM LONG NEEDLES.STROKE 24MM, 3000BPM, WORKING 90PSIAir Needle Scaler and Air Hammer Kit, featuring a 3000 BPM motor and a round shank size of 0.401 inches (10mm). The kit includes both scaler and hammer functions in one convenient package, with a bore diameter of 19mm.