7504PTEKS5538T25A Self tapping screw 5.5x38mm TX25 countersunk, DIN 7504 Kramp

Screws are a self-tapping sheet metal screw with a countersunk head with a drilling tip, reaming wings and cutting ribs under the head. Screws are ideally suited for attaching wood and/or sheet material to steel. The wings of the screws create a wider hole in the wood so the wood can still expand. As soon as it drills into the steel, the wings break off so the screw fits tightly in the steel. The cutting ribs under the countersunk head ensure smooth countersinking in the wood.