This is a pack of different storage tanks that can be used as loads on trucks and for lifting cranes.
The number before the first period is the weight in metric tons and the numbers after are the width in meters.
The name begins with the type of load, followed by the weight in metric tons.
The last is the width.
Example:
EM-43.3
EM = Electric Motor
43 = weight 43 metric tons
3 = width, 3m wide
Weight varies from 71 mt (155,000 lb) to 177 mt (390,000 lb)