Chain Rivet Extractor.Suits most bike chains.Spare chain extractorpin hiddeninside the handle.This is a precision instrument that does the job time and time again without falling apart and well worth the money if you need to use it more than once or twice.When using this this tool make sure the tool pin that pushes the chain pin out stays in the centre of the chain pin and doesnt wander off if it does start again dont keep screwing away. These are much better quality than the cheaper ones - The toolpin is less likely to wander off the chain pin due to the thread on the toolnot being assloppy (Precision cut) and better supported along its length.Thank you.