7/8-9 x 4 Hex Cap Screw SS 18-8 (A2)

2-4 1/2 x 16 Socket Cap Screw Alloy

3-4 A563 Grade A Heavy Hex Nut Hot Dipped Galvanized

41/64 x 6 Reduced Shank Drill Bit (1/2 Shank)

1 3/4-5 x 20 Socket Cap Screw Alloy

3/16 x 1 Mushroom Spike Zinc Plated (100) Jobber Drill Bits - Wire Gauge 7/8-9 x 4 Hex Cap3 16 x 1 Mushroom Spike Zinc Plated (100) . The Spike anchor is a patented, one piece, tamper proof, vibration resistant anchor for use in concrete, block, brick or stone. Several head styles and anchor materials are available. The Spike anchor is formed with an "s" shaped configuration at the working end of the anchor to create an expansion mechanism. Since the anchor is pre expanded, there is no secondary tightening operation required which greatly