Width Across Flats:

Choose type 316 stainless steel for superior corrosion resistance

10 x 2 1/2 Simpson Bugle-Head Self-Drilling Screw - Square Drive 410 SS - Carton (1000)

1 1/8-7 x 11 Socket Cap Screw Alloy

15/32 x 12 High Speed Long Boy 7/16-14 Hex Tap Bolts 18-8 Stainless Steel Width Across Flats:15 32 x 12 High Speed Long Boy . 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