●Material: Constructed of strong 6061-T6 aluminum alloy ●Seat post length: 13.8 inches (350 mm); Diameter: 10.0 inches (25.4 mm), 10.7 inches (27.2 mm), 1.2 inches (28.6 cm), 1.2 inches (30.9 mm), 1.2 ●Adjusts through the clamp, and the angle of tilt of the saddle can be adjusted ●Safety line mark on seatpost. Insert at least above the minimum safety line ●Suitable for: various saddles with clamps, old bikes, mountain bikes, road bikes, and regular bikes