TIPS:Suitable for all kinds of bike,mountain bike ,folding bike,track bike,fixedgear,road bike and so on.Please double measure your outer seat post diameter to get the right size. How to choose:Diameter 31.8mm clamp suits for Frame Seat Tube 30.2mm-32.1mm. Good Design:They have a machined out hollow lever design and a low profile sleek retaining bolt.Ergonomic design,Extended lever, more efficient and comfortable. High quality material:Aluminum alloy, anti-oxidation,the finish is anodized and has somewhat of a matte appearance,durable.Lightweight,Solid,Two strong sleek retaining bolts ensure it to be double sturdy and firm. CONVENIENT: Operation is smooth and easy,easy to install and use, Seat clamp with extra long quick release lever for added clamping force,is great for quick and simple adjustments. .You can adjust your bike seat anytime, anywhere.

Style: Ergonomic. Color: 31.8-black. Brand: Three BY. Material: Aluminum. Date First Available: September 3, 2017. Best Sellers Rank: #103,166 in Sports & Outdoors. Customer Reviews: 4.2 out of 5 stars 365 ratings 4.2 out of 5 stars. : B074P38GQ2. Size: ?31.8mm. Style: ?Ergonomic. Part Number: ?TBY01-1. Manufacturer: ?Three BY. Material: ?Aluminum. Color: ?31.8-black. Brand Name: ?Three BY. Package Weight: ?0.05 Kilograms. Item Package Dimensions L x W x H: ?4.25 x 2.2 x 0.63 inches.