Set contains: (1) Impact power bit #1 Phillips, (1) Impact power bit #2 Phillips X 2'' OAL, (2) Impact power bit #1 Square recess X 2'' OAL, (1) Impact power bit #2 Square recess X 2'' OAL and (1) 1/4'' Quick change extension 2.5'' OAL. IMPACT DRIVER SETS QUICK CHANGE 6 PIECE