Bike Seat Post Length 350mm 25.4mm Black Aluminum Alloy Bicycle Seat Post for Mountain MTB Road Bike Fixed Gear Bike Seatpost N ote: 1. Please measure and check the actual required diameter before purchasing. 2. Package include only 1 piece Bicycle Seat Post, NOT include the saddle clamp. 3. Manual measurement. please allow a little size error. Pa ckage Include: 1 x Bike Seatpost （ 350 × 25.4 mm ） Specification: Quantity: 1 piece bike seat post Material: aluminum alloy D iameter: 25.4 mm Length:350 mm Thickness: 2 mm Color: black How to Choose the Size: 1.Check the diameter of the original seatpost, then choose the same size as your original one. 2.Measure the inner diameter of the frame tube, choose the right size new seat post.