Japanese motorcycle, used, small exhaust valve lifter arm looks in good condition made from hardened steel I would say, unsure of exact make or model, though could be big Yam single or Suzuki etc. Sizes are width of 11mm x counter bored rear is 12.5mm diameter x length of 40.6mm. Cable diameter is 6mm and the arm has 2 raising cams on back to operate the lifting mecanism.