In standard YakAttack fashion, this knob does more than meets the eye. Purchased as a 1/4-20 female knob, it can be quickly converted to a 1/4-20 male knob by simply installing a socket head cap screw through it.
Well made but are too large in diameter where they meet the item being held. Would not work on the item I bought them for.
Convertible knobs are an awesome item. They have wide base for a very secure hold.