This Cycling Seat Tube Adapter provides convenient and quick installation, with an erosion-resistant design for long-lasting use. It provides a more stable internal frame support for the seat tube, meeting different needs. Easy to install, it's a must-have tool for cyclists. Material: Aluminum alloy. Applicable size: 25.4-30.9mm/31.6-34.9mm. The adapter boasts an extended design of 100mm length, giving it greater structural support to withstand the weight and pressure of longer seat tubes.