Thomson X4 Mountain Stems feature smooth edges for carbon bar compatibility and uses bolts that are custom heat treated with corrosion preventative plating. The Thomson X4 is the leader in strength and stiffness. The Thomson X4 stem allows you to realize the benefits of stiffer forks and stiffer 35mm bars. X4 offers precise steering, tracking, and more control while riding, all wrapped up in a beautiful design. Features: Machined 7050 series aluminium Steerer clamp is shaped to save weight and be knee friendly Specifications: Color: Black Material: Aluminum S.H.I.S. Clamp Diameter: 28.6 Length: 50mm Weight: 185g Stack Height: 40.6mm Bar Clamp Diameter: 35.0mm Stem Angle: 0deg