These Alligator anchors with flange nylon expand within a solid surface to help with distributing weight

7/8-9 x 6 Hex Cap Screw SS 18-8 (A2)

#26 x 6 High Speed Aircraft Bit Cobalt

1 1/4-12 x 4 Socket Cap Screw Alloy

7/16 x 12 High Speed Long Boy Hex Washer Head Metal-Panel Screws 316 Stainless Steel These Alligator anchors with flange7 16 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