When i tried this set of knurled drivers, I was disappointed by its lack OF durability and precision. I expected a higher quality from an Industrial and Scientific tool, but these fell short. The knurling wore down quickly and the handles felt flimsy. The only positive was the lightweight aluminum construction which made them easy to handle. However the cons outweighed the one pro, making this set not worth the price. .
Pros
Durable and long-lasting due to being made of sturdy aluminum material.
Cons
The product may slip from the user's hand during use due to the knurled design not providing enough grip.
.9mm hex that I use on my arcade machines. The handle is longer than I thought it would be (6.75 inches - only 171mm). The shaft is 3.25" (82mm) long, the grip itself is 3.5" (89mm) and about 5/8" (16mm) in diameter. . Very well built but like everything, what is so small it can break if you are not careful.I was hoping for a sturdier version but it works well.Reasonable cost - good grip and length.