These are ferrules for iron and wedge clubs, used when assembling golf clubs or reshafting with steel or carbon shafts. Ferrule Specifications: Inner Diameter: Approximately 9.4mm (0.370 inches) Outer Diameter of Base: Approximately 13.7mm Body Length: Approximately 18.9mm Color: Black New and unused. I also use these ferrules for steel shafts (Tip diameter 9.0mm) and carbon shafts (Tip diameter 9.3mm). The shaft thickness near the ferrule installation is generally around 9.4mm, making them widely compatible and versatile. I have confirmed that the quality is also good. If you have any questions, please ask in the comments section. ※Regarding shipping: Regular mail does not have tracking or insurance, and there is no delivery on weekends and holidays. For those who prefer anonymity, tracking, or expedited shipping, please request the following shipping methods: ・Nekopos (anonymous, with tracking, with insurance): add 70 yen ・Click Post (not anonymous, with tracking, without insurance): add 50 yen Please contact me in the comments section before purchasing. I will change the listing after your request. ※For those who want multiple items: Each additional ferrule is 220 yen. Please contact me in the comments section before purchasing to specify the number of items you need. I will then change the listing price and content. ※I am selling four types of ferrules: "for irons/wedges," "for irons/UTs," "for FW," and "for drivers/FWs." Please consider these as well. ※Please check the dimensions of your shaft and hosel before purchasing. ※Please read the profile section.