1.5mm Hex x 2-3/8 in. Precision Screwdriver. Felo 31782 - Hex Precision Screwdriver, Size: 1.5mm x 2-3/8 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.