The HSR-1 heat sink spring-mount rivet connects a screw-mounted microprocessor heat sink to a printed circuit board. The spring portion of the standoff is said to provide constant pressure to the heat sink, which enhances thermal conductivity. The steel spring comes pre-assembled on the rivet, which is made of a durable nylon material. The rivet is installed by hand, first through the heat sink and then through the PC board. Richco, Inc.