This star grip knob can be used in a whole host of applications. It can be used through a gantry into a tee nut to create a v-slot locking mechanism. It can be used as a easy grip handle for CNC Machine clamp adjustment. And can be used with our adjustable hinges for tool free locking. This is just a snippet of where these products can be used. They have a 19.8mm long M5 Thread.