which blades can you guys suggest for cutting pvc pipes. up to 4 inches I am helping a friend with his business. installation of septic tanks, building pools etc. he got a 12V Milwaukee hack saw, comes really in handy when you are in a 6-12' deep trench. I was looking at the "diablo 6-piece" at HomeDepot for 15 bucks but that's kit comes with metal and wood with nails. also with 3 extra blades, 2 general purpose blades and wood blade