ITEM NAME:Aluminum Alloy Road Mountain Bike Seat MTB Clamp Seat Post Clamp Holder #gib Product Description Description: Aluminum Alloy Road Mountain Bike Seat Bicycle MTB Clamp Seat Post Clamp Holder ST-G22 Features: 1.Solve the problem that the bicycle has no shelf mounting holes. Specifications: Material: aluminum alloy Weight: 37g Applicable: 30.8/30.9 seat rod Package size: 100*50*20mm/3.93*1.96*0.78'' Notes: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item.Thanks for your understanding. Included: 1 x Seat Post Clamp.Solve the problem that the bicycle has no shelf mounting holes. Material: aluminum alloy. Applicable: 30.8/30.9 seat rod. If item is defective after 3 months, you can still send it back to us. We will send you a new one after receiving the defective item.