Color and marking: Black over-all with a red-tipped nose and a yellow band forward of the suspension lug.

Construction of body: The nose and barrel of the 100-kg. and 250-kg. are constructed of 1 piece machined tubular steel. On the 500-kg. a steel nose-piece is welded to a tu-bular-steel barrel. The after end of the barrel is threaded internally to receive the tail as-sembly. A row of 12 hexagonal bolts around the circumference of the bomb just forward of the after end of the barrel hold a steel reinforcing plate in place. This cylindrical sec-tion closed at one end by a perforated plate is strengthened by 3 strips of metal bent at a 60° angle, which divide it into 6 equal compartments. Twelve holes are drilled in the outer circumference of the section to accommodate the bolts. TNT is cast in the section to a point flush with its after edges. The tail cone is welded to a collar which screws into the after end of the barrel. Welded to the apex of the tail cone is a burster tube. This tube contains picric acid and is fitted with a fuze adapter at its after end.

Construction of tail: The tail fins are made from sheet steel. There are two layers of steel in each fin, a single piece having been bent double and the two inner edges welded to the tail cone and burster tube by a continous weld. The forward and after ends of the fins are closed by welding. The tail fins are not supported by tail struts.

Figure 10 - Type 4 100-kg., 250-kg. and 500-kg Anti-Shipping Bombs