1/2-13 x 9 Grade 8 Hex Cap Screw Yellow Zinc Plated

3/8 x 3 Mushroom Spike Zinc Plated (25)

1-8 x 4 Grade 8 Hex Cap Screw Yellow Zinc Plated

1-8 x 7 Grade 8 Hex Cap Screw Yellow Zinc Plated

1/2-13 x 8 Grade 8 Hex Cap Screw Yellow Zinc Plated

3/8 x 3 Mushroom Spike 316 SS (25) 3/4-10 Hex Cap Screws 316 Stainless Steel 1/2-13 x 9 Grade 83 8 x 3 Mushroom Spike 316 SS (25) . 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 reduces