The Simpson Strong-Tie GCC is a preassembled MEP (mechanical, electrical and plumbing) fastener designed to secure 1/2", 3/4" or 1" conduit to concrete. The versatile GCC assembly consists of a smooth-shank fastener attached to a conduit clip. This conduit clip is for high-volume applications and works with gas-actuated concrete nailer tools as well as with common powder-actuated tools for fastening into harder substrates (structural steel or extra-hard concrete) when required.