Although it is not the highest rating, there are no other things that can be used for taking out ball bearings, transplanting etc, so this evaluation is required as an essential tool. Mainly used for bicycle bicycles or less, it is very difficult to grip balls with plenty of grease or rust prevention oil with hands and to grease the oils and fats around them. You can grasp one by one precisely, and it will hardly get dirty except in a given place. The disadvantage is that the tip and the contact surface of the ball are not sharp R machining (there is R finish only for unnecessary outer side), the surface of the ball may be scratched with small scratches. Rather than raising the price with the manufacturer's process, it would be prudent to keep the corners with 6φ ball heads or round bar grindstones before use.