Summary: The last set I had had shanks so I had to use them with a chuck drill. They're 1/4" hex so I can use them in my impact wrench. Suitable for drilling soft materials like plastic, wood, and aluminum. Disc. Cons: Doesn't include a case or storage bag. Bottom line: 4 stars for β¬15 (none case). /www.amazon.com/SANUKE-Titanium-Coated-9steps-13steps/dp/B0834QGYT9