These are engine valve guides for cars, tractors trucks etc.these are made in bronze and grey cast iron .with hardness 180 bhn to 220 bhn.they are polished from inside

These are grey cast iron engine valve guides for cars, tractors n trucks

These are engine valve guides for cars, tractors trucks etc.these are made in bronze and grey cast iron .with hardness 180 bhn to 220 bhn.they are polished from inside

These are grey cast iron engine valve guides for cars, tractors n trucks