Backer-On Cement Board Screws Size:#9 X 2-1/4" (100-Pk) 100% waterproof

100% waterproof

The strong hexagonal inner pole

3-flat shank for better grip and control

2 Slice capacity

1-1/8 Om/ solid bit capacity

Backer-On Cement Board Screws Size:#9 X 2-1/4" (100-Pk) 100% waterproofDesigned for attaching fiber cement board such as HardieBacker* to wood or light gauge steel framing. Flush seating in all cement board when angle driven Ability to attach close to edge in all cement boards without fractures or blowouts Stikfit recess for one handed driving, while eliminating cam outs and wobbling Premium corrosion resistant finish to prevent rust from bleeding into grout WHY BACKER ON Backer On Screws provide the optimal fastening