High QualityThis bicycle saddle tube head is made of premium aluminum alloy material, sturdy, durable and lightweight.Suitable ForThe bike seatpost head fits most single pin lockout seatposts on the market.Install Needs1. The original seat tube is fixed by a single screw, the hole diameter is 8mm. 2. There is an anti slip groove at the installation position.Proper SizeThe bike seatpost clamps head saddle pipe is with size 5.5cmx3.3cmx5.1cm/2.17inchx1.30inchx2.01inch, easy using.Product UseThe bicycle saddle tube head is a good replacement of the damaged seatpost head, great bicycle accessory. Specification: Material:Aluminum AlloyColor: Black Size Chart: 5.5cmx3.3cmx5.1cm/2.17inchx1.30inchx2.01inch Package Includes: 1 Bicycle Seatpost Head Saddle Pipe Head Note: Please allow slightly errors due to manual measurement and different monitors.