FastenMaster 8 In. HD Timberlok Structure Screws, 50 Pc are designed for heavy-duty applications, providing exceptional holding power without the need for pre-drilling. These screws feature a countersinking head style and are heat-treated for increased strength, making them i for driving through pressure-treated beams with ease. The heavy-duty threads ensure a secure grip while allowing for easy removal when necessary. For optimal performance, use with a 1/2" high torque, low RPM power drill. Each package includes a 5/16" hex drive bit for convenience. Made from durable carbon steel with an epoxy-coated black finish, these screws combine strength and corrosion resistance to withstand tough conditions. Model Number: FMTLOK08-50