It comes with a bolster that can be tightened firmly with a wrench, etc. The special grip shape makes it easy to hold and fits comfortably. The size is marked on the top of the handle, so you can see it at a glance. This is a penetrating driver that can strike. There is a square socket port on the top of the handle, allowing you to insert a ratchet or torque wrench, etc., to tighten with even greater force.
