Klein Tools 44321 Folding Utility Pocket Knife, Compact EDC with Hawkbill Knife Blade, Button Lock, Pocket Clip, and Tether Hole

3/8" square drive and 17mm outside hex for low profile use with common wrenches or retained in Astro 78318 & 783105 Nano Socket Ratchet Wrenches | Ever grab a 13mm socket and it's too tight, but 14mm feels lose? And it's not SAE? Not every bolt and nut on vehicles remain factory perfect to the millimeter over time and service life | Use 0.5mm under sockets for rounded and damaged bolts and nuts, use 0.5mm over for swollen or corroded bolts and cap covered nuts | For hand tools and impact wrenches, use a hammer to fit 1/2 size under sockets where needed | Forged CRO-MO with simple warranty process, send Astro an image of the broken tool with address and receive replacement