RS PRO Slotted Screw Holding Screwdriver, 0.5 mm Tip, 75 mm Blade

Professional screwdrivers screwdrivers designed for hard to reach screws. Split-bladed screwdrivers for gripping slotted head screws during location and extraction.

Features and Benefits
Blades have a sliding sleeve operated by a plastic collar (just below the handle) which, when pushed down, causes the blade tip to split apart and firmly wedge against the sides of the screw slot.
The blade is released by pulling back the sleeve
Blade thickness is defined in the released condition

Final tightening of screw torque is best achieved by a regualar screwdriver to avoid potential damage to gripping tip.