A Radical RC Innovation! Secure to building board with T-Pin near part. Rotate Cam Clamp to desired clamping force against your part. Simple way to lock together stick or sheet construction where reliable clamping is needed while glue sets. Also doubles as a washer under T-Pins where you don't want to marr the surface of your part with the head of the pin. If you've lost some grip strength over the years, you'll find them handy to grab hold of and pull out building pins. Each sheet contains 24 parts.