4mm-0.7 Zinc Plated Class 8 Steel Coarse Thread Acorn Cap Nuts

Diameter: 4mm
Diameter 2: 7.8mm
Thickness: 7.9mm
Material: Steel
Finish: Zinc
Driver Type: #7 Wrench
Thread Size: 0.7mm (Coarse)
Shape: Domed Acorn
Hardness: Class 8
Type: Cap Nut
Specifications: DIN 1587

Box of 8.

A closed nut having a dome-like cap over the back, protruding part of the engaged screw or bolt. Also called an acorn nut.