Skew Products PGS-5100 RollerDriver Stubby Roller-Clutch Ratchet-Action Screwdriver. 2" Pentogrip comfort and a smooth roller clutch magnetic drive for the tight spots. The RollerDriver is a reversible roller-clutch driver that provides smooth, silent, and stepless ratcheting action. Rugged alloy construction provides high torque capacity and assures long life and trouble-free operation. Magnetic bit holders accept all industry standard 1/4" hex bits.