This eliminates the need for precisely drilled hole depths and allows for easier flush installation

3/4-16 x 4 1/2 Hex Cap Screw SS 316 (A4)

1/2-13 x 10 STRONG-BOLT® 2 Cracked and Uncracked Concrete Wedge Anchor 316 Stainless Steel(25)

3/8-16 x 3 1/2 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (400)

City officials wanted to make sure that the sprinklers would stay up during an earthquake

7/8-9 x 6 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (30) Short Arm Hex Keys Alloy This eliminates the need for7 8 9 x 6 1 2 Grade 8 Hex Cap Screw Plain Domestic USA (30). Grade 8 Hex Cap Screws are manufactured in the USA from medium carbon alloy steel. In diameters 1 4 to 1 1 2 inches our Grade 8 material meets or exceeds SAE J429 Grade 8 specifications. Diameters over 1 1 2 inches meet or exceed ASTM A354 Grade BD. All material is manufactured with rolled threads. Yellow zinc plated bolting will meet or exceed ASTM F1941. Typical hardness on diameters 1 4