Features: Make from Aluminum material, it have strong wear resistance and durability, suitable for long terms football training.The spikes feature is sharply, which can increase the grip and stability of the football shoe on the grass.The screw feature makes it easy to install and replace shoe Stud with simple tool.Suitable for various football field such as natural grasslands, artificial grasslands, and land.The replacement football Stud thread is 5mm and suitable for most standard 5mm threaded football boot and are easy to use and replace.Specifications: Material: AluminumSize: 11MM(0.43inch)/13MM(0.51inch)/15mm(0.59inch)Size: As shown in the picturePackage Includes: 12pcs Football Boot Spikes1pc Wrenchsnote: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.