Help Identify Tool Kit Oil Can and Brushes

Hello. Need some help identifying this item. Army issue and what for?

Found this tube. Inside was the oil can. Two brushes. And a long/thin necked spout. Made in USA on bottom of can.
Tube has written on it (kind of hard to read):
1pc.
486-A-Tool
K8 7666 Iss 3
RM 799152
10-8956-61

Thanks for your help.