9/64 in. x 10 in. Precision Slotted Screwdriver. Felo 31758 - Precision Slotted Screwdriver, Size: 9/64 in. x 10 in. Felo Precision Screwdriver handles are ergonomically designed with a freely rotating cap for minimal friction and a hanging hole for easy storage or inserting lever. The full-length polypropylene core handle has a pleasant soft-grip outer material for added comfort, as well as an anti-roll design. The screwdriver blade is made of Chrome-Molybdenum-Vanadium steel with a black tip for precision fit.