15/16 x 12 High Speed Long Boy (1/2" Shank) Phillips Wafer Cement Board Screws Precision ground for high degree

15 16 x 12 High Speed Long Boy (1 2" Shank) Phillips Wafer Cement Board Screws Precision ground for high degree Precision ground for high degree of concentricity between shank and body diameter Pre drilling is recommended near board ends to prevent splitting Straight shank to 1 2” 1 2” reduced shank for sizes above 1 2” M2 high speed steel Sharp cutting edge to drill in many different materials: Mild Steel Cast Iron Aluminum Wood Extra length flute with continuous cutting edges for drilling deep holes and fast chip removal Reduced shank fits all drill motors with 1 2” chucks Non slip grip prevents the bit from spinning in the chuck 15 16 x 12 High Speed Long Boy (1 2" Shank)