Promax QR 1 Quick Release Seatpost Clamp 31.8mm Silver - Lightweight Bicycle Seat Post Clamp for Mountain Bikes & Road Bikes - Easy Installation & Secure Fit

QR-1 seatpost clamps are cold forged and CNC machined from 6061-T6 aluminum alloy. The QR-1, as the name implies, has a quick release lever, making seat height adjustments a snap. Weighing just 30 grams/1.1 ounces in the 31.8 size, it’s as lightweight as it is tough.

• The head of the lever and the face of the clamp are given a proprietary low-friction surface treatment that ensures smooth lever action for the life of the clamp without the need for a bushing
• Laser-etched graphics and stainless steel hardware