This is a precision slotted screwdriver designed for electronics, instrument, and fine-mechanical work where a standard-width blade is too thick to do the job cleanly. The Vessel 910S4100 MEGADORA Thin Shank Screwdriver carries a slotted (SL4) tip on a narrow 4mm shank, built for screws in tight or delicate assemblies rather than general hand tool work.

Vessel describes this as a "precision type" driver, purpose-built for 4mm or smaller blade diameters - a category apart from its Standard and Tang-Thru MEGADORA lines, which use thicker shanks meant for higher-torque driving. The tip carries a black-point finish that Vessel states holds up regardless of plating thickness on the screw itself, which matters on small plated fasteners where a driver can otherwise slip up out of the slot.

Specs on this model: a 0.5mm tip thickness, 4mm shank diameter, 100mm shank length, 21mm grip diameter, and 178mm overall length. That's a longer reach than the shorter 75mm version in the same Thin Shank line, without stepping up to the 150mm or 200mm lengths meant for deeper recesses.

This driver is a fit for electronics assembly and repair, instrument work, and any task involving small plated slotted screws where a general-purpose screwdriver's blade is simply too wide to seat in the slot without camming out or scarring the surrounding surface.

The Right Size for the Job a Standard Driver Can't Do

The Vessel 910S4100 exists for the exact moment a normal slotted screwdriver is too fat for the screw in front of you.

• Who it's for: Electronics techs, instrument repair, and anyone working plated slotted screws too small for a general-purpose driver.
• Why it stands out: A dedicated 4mm shank and black-point tip built specifically for precision work, not a scaled-down general driver.
• Worth knowing: Data on this exact SKU is limited outside Vessel's own spec sheet - weight and country of origin aren't published, and it's a single driver, not a set, so plan tip coverage accordingly if you need multiple sizes.

• What does "SL4" mean on this screwdriver? Slotted tip, 4mm shank diameter - Vessel's designation for this size in the Thin Shank line.
• How is the Thin Shank line different from Vessel's Standard MEGADORA screwdrivers? The Thin Shank series uses a narrower 4mm-or-smaller shank diameter for precision work, versus the thicker shanks on Vessel's Standard and Tang-Thru lines meant for general and higher-torque driving.
• Is this screwdriver covered under warranty? Yes - it falls under Vessel's standard 3-Year warranty for Vessel-brand screwdrivers.