Strong compatibility: Helmet rail adapter set for FAST helmets with 1921 mm wide rails; supports quick rail attachment or detachment with good flexibility. 360° rotation adjustment: Bracket rotates 360 degrees to improve headset positioning and comfort; adjustable orientation helps ears breathe after long wear. Strong expansibility: Bracket with accessory guide to adapt and add other accessories as needed. Advanced material: Made from nylon and alloy; robust and wearresistant. Use scenarios: Military, law enforcement, or security operations using FAST helmets, enabling fast headset mounting and flexible earphone positioning. Field training, airsoft, or paintball where adjustable orientation enhances comfort during extended use. Industrial or emergency settings where additional accessories can be mounted via the accessory guide for integrated gear compatibility.