McFeelys 8 x 2-1/4 Fiber Cement Board Screws, Stainless Steel, Flat Head, Square...
Now there is a better way to attach fiber cement board siding and trim, or cement backer board to wood sheathing or studs: Use stainless steel Square Drive Screws! Fastening the new fiber cement board products (including siding and backer boards) with standard drywall screws (which can break easily) or nails (which tend to back out over time) can be difficult, and cause problems after installation. Do it right and forget about it! Aggressive nibs under the head of these cement board screws