General description Sealey FDS4 Flip-Over Driver Set is a versatile 4-piece tool set designed for quick changes between piloted countersinking and screwdriving functions. This set is ideal for various applications, making it a valuable addition to any DIY enthusiast's toolkit. Technical specifications Model No: FDS4 Drill bit sizes: 2.38mm, 2.78mm, 3.18mm Hex shank: 1/4" Bits: Magnetic S2 steel PZ1, PZ2, and PZ3 Suitable for screws: No. 6, 8, and 10 gauge Usage Quickly switch between countersinking and screwdriving tasks. Utilize the magnetic bits for secure fastening. Adjust or replace drill bits easily using the hex key fitted on the shank.