The M16 is similar to the M15 except for size. The M16 contains ninety 4 lb. frag bombs when loaded and forms the M29 cluster. The adapter is loaded with bombs in wafer form, each wafer being comprised of 10 bombs. The cluster can be carried on any 500 lb bomb station. It has a third lug for suspension in British planes.
No information about hazardous components.
USNBD - Bombs and Fuzes, Pyrotechnics (1945)