IDEAL Industries 35-154 HD Keystone Tip Screwdriver, 1/4" x 4", Square Shank

Blade length. The 35-154 is the 4 inch version and the 35-156 is the 6 inch version. Everything else is the same heavy-duty keystone-tip build: chrome vanadium steel shank, nickel-chrome plating, cushioned rubber grip, and a square shank. Pick the 6 inch when you need reach into a deep panel or box, the 4 inch when you are working in a tight enclosure.

Yes. Both the 35-154 and 35-156 use a square shank specifically so you can get an open-end or adjustable wrench on it for wrench-assisted turning. That is the main reason an electrician picks a square shank driver over a round one: stubborn panel screws, old painted-in cover screws, and lugs that have been torqued down for years.

Keystone is the flat tip that flares out at the blade rather than tapering straight, so it carries more torque in the slot than a cabinet tip. On the IDEAL 35-154 and 35-156 the tip is cross-ground for a precise, secure fit in the screw slot, which is what keeps it from camming out of breaker lugs and terminal screws. If you need to reach a screw inside a recessed hole where the flare would bind, a cabinet-tip driver is the better choice.

It is built as a heavy-duty driver. The shank is chrome vanadium steel and is deliberately larger in diameter than a standard driver for heavy-duty applications, and the square section lets you add a wrench rather than overloading your wrist. For MRO and service crews stocking tools that get used daily, that larger shank plus the nickel-chrome plating for corrosion resistance is the practical difference from a general-purpose driver.

Two IDEAL Industries part numbers cover it: 35-154 for the 4 inch blade and 35-156 for the 6 inch blade. There is one option to choose, the length, so specify that and the MPN follows.

The tip is vapor-blasted to prevent plate chipping, which matters when you are driving device and cover screws on finished wall plates and panel fronts. Combined with the cross-ground tip, the driver stays in the slot instead of skating across the plate face.

The shank carries nickel-chrome plating for corrosion resistance, so it handles damp service environments, outdoor panels, and truck-stock duty better than a bare or black-oxide blade. The grip is cushioned rubber, which keeps hold when hands are wet or gloved.