I'm an electrician and need 7/8 spare bits all day to get my Romex working. I use regular 6" bits all the time with no problems. I chose the 16" bit to go through the lug packs when my hole face was dead or too bulky. With heavy use I've clicked both in one day. Granted I broke them by drilling 4-6 bolts but c'mon Bosch these things don't come cheap I expect some durability given heavy use.