Tom Thumb metal can securing clips. Tom Thumb Clip Company makes precision can securing clips for shipping and mailing. Our lid clips provide maximum fastening for metal cans..., including paint cans, and are government approved and accepted by all major shipping companies.In use since 1962, Tom Thumb packaging clips are the finest available for those who... require maximum security in shipping cans. They are accepted by the U.S. Postal Service, United Parcel Service (UPS), Federal Express, and U.S. Government agencies, because they have...