There is an unmistakable smell that accompanies anything that used to be used on or near steam engines. It's a combination of steam and oil and smoke and iron and this magnificent, huge, iron bolt has it in spades. Probably hand made by an engineer for a specific application. Absolutely unique in our experience. It goes without saying that this thing will probably stand at least another 100 years usage. Supplied complete with simple keep although this was probably, originally shot into floor.