M10-1.5 X 20mm Metric, Flange Screws, Hex Socket Drive, Locking Ribs, Class 10.9 Steel, Black

Flange under the head acts like a washer to increase the bearing surface and distribute the load.An internal hex socket drive is also known as an Allen drive.Class 10.9 steel is an alloy steel, quenched and tempered, with a minimum tensile strength of...