Thread diameter: 1/4 Inch
Thread shaft length: 3/4", we also supply other length screws, you could find in our amazon store
Thread count: 20 UNC
Fully thread
Color: black
Material: made of grade 12.9 super strong carbon steel
Grade 12.9 means super hard and strong, could used in most heavy duty project
Quantity: 40 pcs in a plastic box
Use 3/16" hex wrench to install the screws
Use 1/4-20 nut and 1/4" SAE washer to fit these, nut and washers are not included in the package
We supply different screws, hooks, wire, ropes, fasteners, quick links and so on, you could find in our amazon store"DGOL" if need

Package include:
40 pcs 1/4-20 * 3/4" super hard carbon steel black socket head screws