Diameter: 12mm
Length: 45mm
Material: Steel
Finish: Black Phosphate
Head Style: Hex Washer (#16 Wrench)
Thread Size: 1.75mm (Coarse)
Thread Length: 30mm
Hardness: Class 10.9
Type: Flange Bolt
Specifications: DIN 6921

Box of 39.

A flange bolt has a wide flange beneath the hex head of the bolt. Applied with a wrench.