Check the listing for details. Kink BMX Master Clamp - Matte Black. Color: Black, Condition: New. Listed at 12.99 USD. Kink BMX Master Clamp - Matte Black The Master Clamp features a custom bolt design that fits both a 5mm and 6mm allen key. This seemingly small feature makes things just a little bit simpler because we all know the feeling of grabbing the wrong size allen key wrench. This also means no matter which seat system you use you’ll still only need one allen key to adjust the entire seating setup. Beyond the bolt the seat clamp is made from industry standard 6061-T6 aluminum and features a slim low profile design. Features: Kink Master Clamp CNC Machined from 6061-T6 Aluminum Ultra Slim and Low Profile Design Custom 5mm/6mm Combination Bolt Installs with 5mm or 6mm Allen Key Weight: 0.7oz At SkatesUSA our primary goal is to give our customers the best deals on skateboards, longboards, scooters and bikes at the lowest price. That is our commitment to you, our valued customer.