UNBREAKABLE WITH ABNORMAL USE!

• 4mm hex to work with ifixit and similar bit screw drivers.
• 4140 steel which means it is corrosion resistant, hard enough to handle the torque required to unscrew and screw in valves, and will be attracted to magnets.
• Black nitrided
• Tokyo Marui style is compatible with brands such as: Tokyo Marui, VFC, KWA, KJW, and WE Tech.
• GHK style is compatible with brands such as: GHK and ViperTech.