They can carry twice the weight of a standard wing anchor but only require a ½ inch hole

15/32 Heavy Duty Drill Bit - Stubby Length

5/8-11 x 1 1/2 Socket Cap Screw 316 Stainless Steel

1/4 x 4 Flat Split Drive Anchor Mech Galv(100)

1/4 x 2 1/2 Flat Split Drive Anchor Zinc Plated (100)

#38 x 6 High Speed Aircraft Bit Cobalt (6) 1/2-13 Grade 8 Hex Cap Screws Yellow Zinc Plated They can carry twice the#38 x 6 High Speed Aircraft Bit Cobalt . Manufactured to NAS 907 Type J specifications Jobber flute lengths for drilling holes in hard to reach places Heavy duty construction for portable or machine drilling For use in drilling in high tensile strength alloy steels, stainless steels, titanium and other difficult to machine materials Made in the USA