Diameter: 20mm
Length: 200mm
Material: Steel
Finish: Zinc
Head Style: Hex (#30 Wrench)
Thread Size: 2.5mm (Coarse)
Thread Length: 54mm
Hardness: Class 8.8
Type: Cap Screw
Specifications: DIN 931

Box of 2.

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