slot head screwdriver - Bit History: The Spanner - iFixit bm888 slot

The x-shape of the screwdriver head fits into the similarly shaped slot of the screw and is held in place so the force of the torque is naturally centered, ensuring that the screw is driven straight.

smseace 2-Pack 12-Inch Slotted & Phillips Screwdriver Set, Long Flat Blade & Cross-Head Design, Magnetic Extended Screwdriver With Rubber Handle - Amazon.com.

Multi-component power handle with grip zone optimized for torque and comfort. Blade of chrome vanadium steel. Supplied with: 1 pc. each slot-head screwdriver No ...