Holo-Krome 32118, 1/4-20x3/8 Cup Point Socket Set Screw, Steel, Black Oxide, UNC, 100/Pk

The Cup Point digs into the contact surface for maximum holding power under pressure. The Knurled Point features better locking power than the standard Cup Point. The Knurled Point combines the digging action of the Cup Point with counter-clockwise locking knurls that have a ratchet-locking action that helps resist loosening, even under the most severe vibrations., Lot of 1