consider the (BB™) 1/4-20 Toggler SNAPTOGGLE® Heavy Duty Toggle Bolt Zinc Plated (100)

306 inches

which can be any number you see fit for your job

3/16 x 4 Powers Round Toggle Bolt Zinc Plated (50)

1/2 x 5 Titen HD Concrete Anchor Mech Galvanized (20)

3/16 Heavy Duty Jobber Drill Bit (12) Spike Impact Anchors Zinc Plated consider the (BB™) 1/4-20 Toggler3 16 Heavy Duty Jobber Drill Bit . Web construction is heavier than general purpose construction making it particularly suitable for cotter pin hole drilling and cross hole drilling in head of bolts. The heavy construction affords efficient drilling in stainless steel and other hard materials. The split point reduces the thrust requirements and minimizes walking.