Diameter: 18mm
Length: 40mm
Material: Steel
Finish: Plain
Head Style: Hex (#27 Wrench)
Thread Size: 1.5mm (Extra Fine)
Thread Length: Full
Hardness: Class 10.9
Type: Cap Screw
Specifications: DIN 961

Box of 2.

A hex cap screw has a hexagonal head, designed to be driven by a wrench.