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. Weight: 19.8g / 0.7oz.