Metric set screws, Allen, Cup point, Stainless steel 18-8 (A-2), 2.5mm x 0.45mm x 5mm

Screws with no head and machine threads for use in a tapped hole.

Allen (hex socket) drive is a six-sided recess for use with an Allen wrench (hex key).

Cup points have a cup-shaped point to indent into the contact material and is a commonly used style for permanent or semi-permanent installations on soft or hard surfaces.

Also known as A-2 stainless, 18-8 is the most common grade of stainless steel for general use.