Thomson Bicycle Seatpost Clamp (31.8mm， Black)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Made using the highest quality materials </span></li><li><span class="a-list-item"> Tested for durability </span></li><li><span class="a-list-item"> Precision engineered </span></li><li><span class="a-list-item"> Diameter: 31.8 millimeter， Diameter: 31.8 millimeter， Seat Collar Diameter: 31.8 millimeter， Seatpost Color: Black </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41sYywPQkSL.jpg" noproxy>