Diety Circuit 31. 8mm Seatpost Clamp Clamp it Down If you're looking to add some color to your ride, then you'll need an awesome seat clamp. The Diety Circuit Seatpost Clamp is a CNC-machined 6061 T6 aluminum clamp with a minimized design. It has a super low stack height for added clearance and an oversized bolt for added clamping power. Features CNC-machined from 6061 T6 aluminum Minimized design with maximum machining to decrease weight Super low stack height for added clearance | Deity | Circuit 31. 8Mm Seatpost Clamp Black