Klein Tools BD284 1/4-Inch Keystone Screwdriver 4-Inch Square Shank

No. The BD284 is not insulated and will not protect against electrical shock, so keep it off energized circuits. The chrome-plated shaft and nickel-chrome blade are built for corrosion resistance and torque, not dielectric protection. If you need to work live, you need a tool rated and marked for insulated use instead.

The tip is a 1/4 inch (6.4 mm) keystone, which is the flared slotted profile. Keystone means the tip widens toward the shank rather than running parallel, so it seats in standard slotted machine screws, panel screws, and terminal screws cut for a 1/4 inch slot. It will not bottom out in a deep recessed slot the way a cabinet-tip driver does, because the flare catches the countersink.

Yes, the shank is square, which is exactly what that profile is for. A 4 inch square shank lets you close an open-end wrench on the flats and break loose a seized or painted-over slotted screw without twisting the handle off. Internal flanges anchor the shaft in the handle to resist that twist. Do not use it to pry or chisel.

The BD284 gives you 4 inches of shank with an 8.5 inch (21.6 cm) overall length, so roughly half the tool is handle. That reaches terminal screws in a standard device box or panel gutter comfortably. For screws set back further than 4 inches, or in a tight raceway where the oversized handle will not clear, you want a longer-shank driver or a stubby, depending on which way the clearance problem runs.

No, the tip is not magnetized. For holding a cover screw in place one-handed overhead you would need a magnetized driver or a magnetizer. The black oxide tip finish here is for grip in the slot, not for pickup.

It is a deliberate tradeoff. The Comfordome handle is 35 percent larger than comparable screwdriver handles and delivers up to 50 percent more power, which is why this driver suits stubborn panel and terminal screws. The flip side is bulk: the tool measures about 1 inch across, and in a crowded junction box or between closely spaced devices that handle will be the limiting factor, not the shank.

It meets or exceeds applicable ASME / ANSI specifications for hand screwdrivers, and it is made in the USA. That is the spec line institutional and MRO buyers usually need on a tool crib purchase order. Note that it carries no insulated rating.

Order it as Klein Tools BD284. The handle is yellow plastic, the shaft and blade are steel, and the tool weighs 4 oz (113 g). Same amber Comfordome handle shape across the family, so it racks and reads consistently with other Klein drivers in a shop set.