Hi Karen, thanks for your question. Starborn's Pro Plug System and FastenMaster's Cortex System are comparable in that they are both hidden fastening systems, just two different brands by two different manufacturers. Cortex is only available with 2.5" epoxy-coated carbon steel screws, whereas Pro Plug System has two screw options: 2.5" 305-grade stainless steel and 2.75" epoxy-coated carbon steel.