The pinch clamp and body starter are transformed from Unibody clamp. It's a specialized tools origionally used in automobile repair. It consists of two sturdy jaws that can be adjusted and positioned around the vehicle's frame or structural components. Thanks to this feature to tighten the pinch clamp with speed rail starter securely in place or using body starter to go into the hole underneath the car then add a baby pin or speed rail starter like KS-096, KCP-656, KS-508, KS-525, KS-514 by compressing against the metal. 
Great gardet for car camera mounting solution. The Kupo KS-372 is the stainless steel mini-flat body starter with 3/8"-16 male thread. (Set of 2)