Klein Tools Square Insert Power Driver 1" Pk 5

Three square drive sizes: #1 (SQ115), #2 (SQ215) and #3 (SQ315). All three are 1-inch insert bits sold five to a pack, so a #1 order gets you five #1 bits, not a mixed set.

They're built for impact use. Klein states these square insert power drivers are designed and constructed to withstand impact drills, and they're custom heat treated for long life. Standard caution applies on any insert bit: don't pry or chisel with it, and wear eye protection.

For most construction and electrical screws, #2 square (SQ215) is the size you'll reach for most, with #1 (SQ115) for smaller fasteners and #3 (SQ315) for heavier lags and larger wood screws. Square drive is sized by number, not by fraction, and the fit is unforgiving, so match the number stamped or specified on the fastener. These are precision machined for a consistent fit in the recess.

Yes. A 1-inch insert bit uses the standard 1/4-inch hex shank, so it drops into any 1/4-inch quick-change chuck, magnetic bit holder, or bit tip holder. Insert bits are the short ones meant to live in a holder; if you want a bit that goes straight into the tool without a holder, you want a 2-inch power bit instead.

Yes, these square insert power drivers are made in the USA. That matters if you're buying against a domestic-preference or Buy American purchasing policy on a public or institutional job.

Five. Each pack is five identical bits of the one drive size you order, which is how most electrical and MRO crews buy them, since square bits are consumable and tend to get spread across a truck or a tool crib rather than used one at a time.