Precisions Compatibility: Specifically designed for TT685 and V850II speedlights, these screws provide a secure and tight fit to loosening during photography Easy Installation Process: Technical skills required the user friendly design allows quickly installation for replacement or maintenance purposes Enhanced Shootings Stability: The screw head and prevents slippage, ensuring your Flashing stays firmly attached for uninterrupted shootings Premium Materials Construction: Made from ABS materials, these screws ensures durability and resistance for long terms use with TT685 and V850II Flashing units Complete 4 Piece Set: Includes four replacement screws to accommodate multiple Flashing units or serve as spares, offering practical value for professional photographers and enthusiasts