This is a Bleed Port Screw & O-Ring it for Shimano hydraulic brake levers.

FEATURES

• Replaces lost or broken bleed port screw & o-ring
• Take care when installing. Do not overtighten. It is very easy to strip
• 105 and Dura-Ace/Ultegra screws can generally be used interchangeably; however, the hex key size required may be different  

COMPATIBILITY

• 105: 105 ST-R7020, 105 ST-R7025, Tiagra ST-4725, Tiagra ST-4720, GRX Di2 ST-RX815, GRX ST-RX600, GRX ST-RX400
• Dura-Ace/Ultegra: Dura-Ace ST-R9120/Ultegra ST-R8020
• Dura-Ace/Ultegra Di2: Dura-Ace ST-R9270/Ultegra ST-R8170
• SLX/Deore: SLX BL-M666, Deore BL-M596 ("B" fit for XT BL-M8000 and BL-M785)
• XT/SLX: XT BL-M8000, SLX BL-M7000 ("B" fit for XTR BL-M9020, XT BL-M785)