The split drive anchor is a one-piece tamper-resistant

7/8-9 x 5 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated

The Spike® anchor is formed with an "s" shaped configuration at the working end of the anchor to create an expansion mechanism

3/4-10 x 4 Socket Cap Screw 18-8 (A2) Stainless Steel

Diameters over 2 1/2 inches have a meet a minimum of 140

11/64 Heavy Duty Drill Bit - Stubby Length (12) A563 Grade A Heavy Hex Nuts Hot Dipped Galvanized The split drive anchor is11 64 Heavy Duty Drill Bit Stubby Length . Designed for use in machines and portable drilling in hard sheet metal alloys such as stainless steel and titanium.