GRK R4 Multi-Purpose Framing Screws are used for wood, plastic, cement fiber board, particle board, sheet metal, wood decking and melamine. The GRK R4 Multi-Purpose Framing Screws come in a variety of sizes/gauges from 1-1/4 in. to 12 in. L. CEE Thread is available on R4 screws starting at #8 and 2″ long.