The Pin Clamp puts a larger head on a standard dress maker pin. Pin clamp is tight on the pin, but can be forced to slide up and down on the pin shaft. Place a pin near the object to be clamped, then slide the clamp down so that it is pressing down on to the object. With this system the dress maker pin is not pushed into the wood thus preventing the wood from spliting. Geat for building light weight small electrics. 50 per package.