Handle for a 1/4" nut driver. I purchased a set of security bits that had the 1/4" socket but no handle. Knocked this out in about 5 minutes with a couple of boolean objects in my 3D application.
UPDATE: New sizes available! The Husky model is 20mm longer and 25% bigger in diameter. The Stubby models are shorter and also come in two sizes. Let me know if you would like to see more versions!
Printed it with 2 shells and 50% fill for a little more durability.