Screw assortment for model making High-quality screw assortment in the dimensions from M2 to M6, consisting of 1340 parts. Included are cylinder head screws, washers, self-locking nuts, offset screwdrivers, servo screws and drive-in nuts. All screws are in grade 12.9 (high-strength steel). This makes it almost impossible to round off the screw heads.