http://tinyurl.com/m5bf683

Projekt Fixie - Fixed Gear Mountain Bike Mtb Road Cycling Track Bike Seatpost Clamp

Fixed Bolt Seat Clamp for Better Seatpost Security, Theft Prevention

For 25.4mm/ 27.2mm Seatpost

28.6mm clamps fit 25.4mm seatposts; 31.8mm clamps fit 27.2 seatposts

Road, BMX, Mountain, Fixed Gears, Fixies, Track, Singlespeed Bikes

Compatible with other Projekt Fixie components