Dia-Compe's popular hinged MX seat clamp from the early 1980's now available in 28.6mm size. These are BRAND NEW - they are not * Color: BLACK * Size: 28.6mm (1 1/8") inner diameter (fits most frames that take a 25.4mm (1") seat post, but as always, measure the outer diameter of the seat mast tubing of your frame or the inner diameter of your existing seat * Material: Aluminum alloy * The "MX" is stamped - the "Dia-Compe 28.6" on the top edge is laser engraved.