Diameter: 16mm
Length: 30mm
Material: Steel
Finish: Red Rinsed Zinc
Head Style: Hex (#24 Wrench)
Thread Size: 2.0mm (Coarse)
Thread Length: 30mm
Hardness: Class 8.8
Type: Cap Screw
Specifications: DIN 933

Box of 30.

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