Single side pic and one of the longer reach tong sets. The tongs have removable tips so I grind them for larger or smaller spot weld look. The single sided is controled more by setting and being sure the ground is on the correct piece of sheet metal on the correct side. That is everything on sinle sided welding or you will have what most people talk about as ending up with, a weld that will not hold or look correct. Hope this will give everyone a better idea of the unit Jay. www.jaycuda.com