Designed for attaching HardieBacker or equivalent fiber cement backerboard to wood or light gauge steel studs. Patented serrated head design countersinks for flush seating at any angle, providing a smooth surface for tile. Star drive recess with T-25 bit provides for one-handed installation. Climacoat corrosion resistant finish prevents rust from bleeding into grout and are perfect for use in high moisture areas. Conforms to ANSI A108.11 for cement board attachment. FEATURES Star drive with T-25 bit: provides Stikfit™ for easy one-handed installation and eliminates cam-outs Hi-Lo / Single Threads: starts quickly and drives smooth in cement boards. Sharp points: Offers immediate pick-up and eliminates the need to pre-drill. Serrated thread design reduces installation torque and provides superior holding power Climacoat finish: Corrosion resistant for preventing rust from bleeding into tile. Complies with ANSI standards for cement board installation