Massively popular seat post clamps in Hope's 7 anodized colours.  Six sizes available to suit pretty much any modern mountain bike. Hope bolt seat clamps are perfect for use with a dropper seat post. Please note, the seat post diameter size refers to the seat tube of your bike, not the seatpost diameter. If your bike manufacturers website doesn't list the size, the best option is to measure it your self with a set of vernier calipers. Machined from billet 2014 T6 aluminium. Spherical bolt and nut for perfect alignment and even clamping force. Weight from 20g. Size 28.6, 30, 31.8, 34.9, 36.4, 38.5 and 39.7mm diameter.