This attachment can turn your flashlight into lantern/night lights without harsh, overly bright light beam
These models don't have any tolerance added, it fits snugly on my flashlight.
Type 3 and 4 are meant to have light bouncing to the back body of the flashlight itself.
Type 2 and 4; one with inner cones are meant to ‘reflect’ the focusing beam to the wall of this attachment
The author hasn't provided the model origin yet.