Compatible with standard bat ferrules. Head tip: approximately 9.8mm Bat ferrule: approximately 9.0-9.5mm Cork has some missing pieces. No manufacturer markings. This is a very old item, so there is some age-related deterioration, but it is still usable. Only for those who understand old, vintage, and used items. Only for those who understand Japanese. Only for those who can facilitate a smooth transaction. Topwater Old Rod Champion Grip