Klein Tools A216-4 1/8-Inch Cabinet Screwdriver 4-Inch Round Shank

No. The A216-4 is not insulated and will not protect against electrical shock. Klein states it plainly in the product warnings. It's built for electrical and telecom work in the sense of fitting recessed holes and tight enclosures, not for working energized. If you need shock protection, you want a driver rated and marked as insulated, typically 1000V rated. De-energize before you use this one, and wear approved eye protection.

The A216-4 has a 1/8 inch (3.2 mm) cabinet tip. Cabinet tip means the blade sides run parallel to the shank instead of flaring out, so the tip drops straight into a recessed or counterbored screw hole without the shoulder binding on the way in. That is the geometry that suits device terminal screws, panel screws and small slotted terminals in tight enclosures. Check the slot on your screws: 1/8 inch is a small blade, so oversized slotted screws will want a wider tip.

Shank length is 4 inches (10.2 cm) on the A216-4, with 7 inches (17.8 cm) overall including the handle. That 4 inch round shank is the working reach, so it will get down into deep device boxes, panel gutters and recessed terminal wells. The round shank is small diameter, which is what lets it pass through a narrow bored hole rather than stopping at the mouth of it.

No. The A216-4 has a round shank, not a square or hex bolster, so there is no flat for a wrench to grip. Torque comes from the handle only. If you need to put a wrench on a driver for a seized screw, look for a square shank or bolstered model instead. Klein also warns against using this driver to pry or chisel.

The A216-4 is not magnetic. The blade is nickel-chrome with a black tip and a chrome-plated shaft for corrosion resistance, but there is no magnetization to hold a loose screw. If you are working overhead in a panel and want the screw to stay on the tip, plan on a magnetizer or a holding driver.

A cabinet tip, which is what the A216-4 carries at 1/8 inch, has parallel-ground sides so the blade is no wider than the shank at the tip. That lets it enter a counterbored or recessed hole cleanly. A keystone tip flares wider than the shank, which gives more blade surface and more torque on an exposed screw head but will hang up on the shoulder of a recessed hole. For electrical device terminals, panel screws and telecom work in tight boxes, cabinet tip is the one you want; for general slotted screws out in the open, keystone is the stronger blade.

Order Klein Tools A216-4. That is the single model: 1/8 inch cabinet tip, 4 inch round shank, 7 inch overall. Klein's A216 family runs several shank lengths in the same tip style, so the -4 suffix is the part that pins the shank length. Give a supplier just "A216" and you may get a different reach than you wanted.

Made in USA, and Klein states the driver meets or exceeds applicable ASME/ANSI specifications. The blade is precision-forged and polished nickel-chrome, and the handle anchors to the shaft with internal flanges that resist the shaft twisting loose under load. That anchoring matters more than it sounds on a small-diameter shank, because a 1/8 inch tip is easy to over-torque.

Just 0.8 oz (23 g), so it disappears in a pouch or a shirt pocket. The handle is Klein's amber Comfordome plastic in yellow, smooth and shaped to sit in the palm rather than in the fingertips, which is what lets you put steady turning pressure on a small tip without the handle digging in.