This is a model of a grenade, like the ones used in Warld War I. This model was created in Lightwave 7.5d. This file is a .obj file, so it should import in to most 3d modellers. There is another similar grenade 3d mesh on Turbosquid that is only a .lwo file. Since few packages besides Lightwave support that filetype, I uploaded this version of the file so that you can use the file if you do not have Lightwave and still have need of a grenade model.