8-18 x 3/4 #6HD Unslotted Indented Hex Washer High Low Screw Fully Threaded Zinc MSO188 They have a 3/4-10 thread

They have a 3/4-10 thread size and are 8 inches long

The threads are 18 threads per inch

The 7/8-9 Slotted Heavy Hex Nut Plain is a durable and reliable nut that is perfect for a variety of applications

The sharp drill bit tip allows for easy penetration

The 2-56 x 5/16 Phillips Pan Split Lock Washer Sems Fully Threaded Zinc is a type of screw that is used to fasten two pieces of metal together

8-18 x 3/4 #6HD Unslotted Indented Hex Washer High Low Screw Fully Threaded Zinc MSO188 They have a 3/4-10 thread#6 x 3 4" #6HD Unslotted Indented Hex Washer High Low Screw Fully Threaded Zinc. A fully threaded, hex washer head screw with an indented hex drive and zinc plating. The screw is designed for use in high low applications, where the head of the screw is countersunk below the surface of the material. The indented hex drive provides a secure grip for driving the screw, and the zinc plating provides corrosion resistance.