Vktech New GUB CX-49 Aluminum Alloy Bicycle Bike Seat Post Clamp QR Quick Release These aluminium quick release seat post clamps are fantastic value and light weight due to the CNC machined design They have a machined out hollow lever design and a low profile sleek retaining bolt, which means they are light and solidly made Anodised finish (Choose from Red, Blue, Titanium, Gold or Black) CNC Machined, hollowed out lever Caliber: 34.9mm