Socket head cap screws have cup points that produce a thin edge that digs into hard surfaces for a secure hold.
.Size: 3/8 inch-16 X 1-1/4 inchHex (Allen) DriveInstalls using an Allen wrenchCan be used in tight spaces where there may not be room for a socket tool or wrenchOften used in machinery, tools & diesThread Type: Coarse, Thread Class: UNC-3A, Point Style: BluntSpecification(s) Met: ASME B18.Socket Head Cap Screw, Allen Dr 3/8in-16 X 1-1/4in Grade 18-8 Stainless Steel 10PK Length is measured from underneath the head to the base of the cup point.3 & ASTM F837 Rounded head has splined outer circumference with internal hex drive.