Diameter: 4mm
Length: 40mm
Material: Steel
Finish: Zinc
Head Style: Hex (#7 Wrench)
Thread Size: 0.7mm (Coarse)
Thread Length: 40mm
Hardness: Class 8.8
Type: Cap Screw
Specifications: DIN 933

Box of 50.

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