as the anchor remains in place and allows you to use it repeatedly

Square drive prevents cam out and stripping

Chemical Composition:

8 x 1 5/8 Simpson Fiber-Cement Screws T17 316 SS - Box (100)

25/64 x 12 High Speed Aircraft Bit Cobalt

5/16-24 x 2 1/2 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (850) 6" Aircraft Bits Cobalt - Wire Gauge as the anchor remains in5 16 24 x 2 1 2 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (850) . L9 High Tensile Strength Hex Cap Screws are designed for use in high stress, severe service environments. The highest mechanical strength off the shelf fastening system available, its special features control torque tension characteristics to develop high clamp loads when using properly controlled tightening methods. Brighton Best manufactures L9 bolting from AISI alloy steels.