How do I determine the size of the hammer handle? Well, I'll explain the concept of hammer handle size. The size of the hammer head depends on the size of the hammer made. the size of the hammer head. The important thing is whether you fit the size of your hand when you hold the hammer. The most important thing is that the size of the handle fits your hand. and difficult to grip. It is difficult to grip even if it is too large. Firmly select the size that is easiest for you to grip I think it's the right size for you to know the size that you can easily grasp It is also necessary to Consider the length of this handle at the same time.When you hold it like this,if the tip of the handle is long enough to come to your joint, I think it's very easy to use.This is a good way to size your hammer handle for you..