The Easton EA 50 saddlebag is the gateway to the category of quality saddlebags. the durable body is made of aluminum alloy with a forged adjustable aluminum seat post clamp mechanism with a 10 millimeter offset, allowing you to fully adjust the seating position on your favorite bike. Surface finish: black anodization Weight: 310g (31.6mm) Offset: 10mm Length: 350mm Diameter: 27.2-, 30.9-, 31.6mm Material: EA50 ALLOY