Choose Collars you need to fit the OEM brands, 7075 AirCraft Aluminum. Taylormade: all driver/fw after r11s. including: Qi4D, Qi35 back RBZ2. code: tm-fit; Screw A Callaway: all driver/fw after Quantum to X2 Hot. does not fit epic flash fw. code: ca-fit; Screw B Titleist: GTS, GT to 910 drivers, and 910fw code: TL-fit; Screw B Cobra: all driver/fw since bio cell. code: cb-fit; Screw C Cobra 2025+ DS Adapt /Optm code: cb-fit25; Screw C Pxg: all driver/fw. code: pxg-fit; Screw B20 Ping: g400, g30 series driver/fw. code: pn-fit; Screw A10 Ping: g410, g425, g430 series driver/fw. code: pn-fit2; B20 Mizuno: all driver after jpx ez. code: mz-fit; B Screw Tour Edge: since ex10 driver, ie, ex10, exs, ex220, c/e721, 722, 723. code: te-fit2; C Screw Srixon adjustable drivers. code: sr-fit; Screw A10 Wilson dynapower driver. code: wls-fit; Screw B Bridgestone: all drivers. code b-fit; Screw C Titleist fw: GTS , GT to 913f, except 910f. code: TLF-fit; Screw A Callaway epic flash fw. code: caf-fit; Screw A Callaway Quantum Fw, code: CAF-Fit26; Screw B20