Diameter: 12mm
Diameter 2: 21mm
Thickness: 10mm
Material: Steel
Finish: Zinc
Driver Type: #19 Wrench
Thread Size: 1.0mm (Extra Fine)
Hardness: Class 8
Type: Hex Nut
Specifications: DIN 934

Box of 50.

Hex nuts are used to secure and fasten the threaded portion of most machine screws and bolts.