You can utilize these pieces of hardware in solid or hollow surfaces

Common flute and overall length for minimal adjustment during tool changes

3/4-10 x 5 1/2 Socket Cap Screw Alloy

as you only have to pay one flat rate regardless of the quantity you choose

21/64 Heavy Duty Jobber Drill Bit

17/32 x 6 Reduced Shank Drill Bit (1/2 Shank) 1/2 Hex Lag Screws Hot Dipped Galvanized You can utilize these pieces17 32 x 6 Reduced Shank Drill Bit (1 2 Shank) . Expands the size range capacity of a 1 2 inch portable drill chuck. Common flute and overall length for minimal adjustment during tool changes. Precision ground for high degree of concentricity between shank and body diameter. Ideal for drilling in low and medium tensile strength materials.