This is a driver 1W and fairway wood socket used when assembling or reshafting golf clubs. Socket Specifications: Inner diameter: Approximately 8.5mm (0.335 inches) Bottom outer diameter: Approximately 12.7mm Body length: Approximately 12.5mm Body color: Black New and unused. I also use these sockets for my driver and FW, and I have confirmed that there are no quality issues. If you have any questions, please ask in the comments section. *Regarding standard mail (without tracking/compensation): Delivery is not available on weekends and holidays. For those who prefer anonymity, tracking, or expedited shipping, please request the following shipping methods: - Nekopos (anonymous, with tracking, with compensation): Add 70 yen - Click Post (not anonymous, with tracking, without compensation): Add 50 yen Please contact me via the comments section before purchasing. I will change the listing content after your request. *For those who want multiple items: Each additional socket is 220 yen. Please contact me via the comments section before purchasing with the number of sockets you need. I will change the listing price and content after your request. *I also sell four other types of sockets: "for irons/wedges," "for irons/UTs," "for FW," and "for driver/FW," so please consider them as well. *Please check the dimensions of your shaft and hosel before purchasing. *Please read the profile section.