3/16 x 2 1/2 Mushroom Spike Zinc Plated (100) 1 3/8-12 Socket Cap Screws Alloy 21/64 Cobalt Heavy Duty Jobber

21/64 Cobalt Heavy Duty Jobber Drill Bit

#37 Heavy Duty Drill Bit - Stubby Length

Galvanized nuts are over tapped per ASTM A563

1/4 x 4 Mushroom Spike Zinc Plated (100)

3/16 x 2 1/2 Mushroom Spike Zinc Plated (100) 1 3/8-12 Socket Cap Screws Alloy 21/64 Cobalt Heavy Duty Jobber3 16 x 2 1 2 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