3 4 x 18 High Speed Long Boy (1 2" Shank) Square Bugle Head Decking Screws Dacrotized new longer and stronger plastic new longer and stronger plastic straps that now work in base materials 3 8" to 3 5 8" thick You can utilize these pieces of hardware in solid or hollow surfaces 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 3 4 x 18 High Speed Long Boy (1 2" Shank)