Gotaout Anti-skid Lightweight Aluminum Black Bike Pedals For MTB Road BMX Bicycle Size: 5" x 4" x 1", Axle Diameter: 9/16" - comes in pair Material: Lightweight aluminum all CNC precision process, ensure the assembly precision. Advantage: Antiskid nail surface, strong grasps, no longer skid. The pedal adds slash form a triangle support, so that the pedal is more stable, more practical. Installation: The pedal axis screw distinguish left and right, "R" "L" mark the direction of right and left. We suggest to use 15mm professional open end wrench to install the pedals. Suitable for: BMX, mountain bikes, road bikes, fixed gear bikes, etc.