18-8 stainless steel hex tap bolts will have a typical composition of 18% chromium and 8% nickel

9/16 x 8 Ship Auger Wood Bit

1-14 x 6 Grade 8 Hex Cap Screw Yellow Zinc Plated

SNAPTOGGLE® toggle bolts are more useful

#6 Heavy Duty Jobber Drill Bit

M16-2.0 x 220 Hex Cap Screw 8.8 DIN 931 Zinc Plated Square Trim-Head Self Drilling Siding Screws 410 Stainless Steel 18-8 stainless steel hex tapM16 2. 0 x 220 Hex Cap Screw 8. 8 DIN 931 Zinc Plated Class 8. 8 Hex Cap Screws are manufactured from medium carbon steel, quenched and tempered. These are premium quality, medium strength fasteners with partially threaded shanks conforming to DIN 931.