Surly says..... Rated fully KICKASS by the U.S Department of Wicked S&*t, our cast and polished stainless steel clamps won't rust or chip paint because they can't (even the black ones !).
They're shiny! They look good! And most importantly, they deliver the compatibility seatposts crave.
Material: Stainless steel
Size: 30.0mm & 33.1mm
Colour: Silver or Black