A screw driver system includes a screw driver and a guide clamp. The screw driver includes a driving bit. The driving bit includes a body having a first end and a second end and an outer surface comprising a cylindrical portion between the first and second ends. The screw driving bit includes a first circumferential groove and a second circumferential groove on the outer surface of the cylindrical portion each having a bottom surface. The bottom surface of the first circumferential groove defines a first outer diameter that is larger than a second outer diameter defined by the second circumferential groove. The guide clamp includes a jaw for holding the screw driving bit. When engaged with the first circumferential groove, the guide clamp prevents rotation of the screw driving bit. When engaged with the second circumferential groove, the guide clamp does not prevent rotation of the screw driving bit.
