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Features :
Thread Size:1/4-20
Hex Drive Size: 7/16''
HIGH QUALITY MATERIAL: 100% Stainless steel 304(18-8) which is superior to regular steel and any zinc plated fasteners, provides good strength and corrosion resistance in bad environments.
Will NOT COME LOOSE: With a nylon insert inside, the lock nuts greatly reduce loosening under vibrations and torque.