Here are 3 shot blasters the big one in the middle is a 9 inch and it is a beast it gets into corners better that the other ones in is self propelled and runs on 220 it really eats up the concrete it is faster than the other ones the white one is B & W and works really good it is a inch the green one works it needs a clamp on the cable that opens the door to drop the beads the big one comes with a vacuum