25lb 9x1-5/8" Cement Board Screws Works with all types of cement board including Durock Hardibacker Permabase Deep #2 Phillips recess allows for more torque Extra sharp threads and point drills faster and cleaner Engineered knurling under head crushes cement board as it drive Larger head diameter for better holding power and seats flush Drives with a standard #2 Phillips bit Drives with an ACR2 Phillips bit included