adidas F50.6 TUNIT Stud Key - Men's Stud wrench to use with all adidas TUNIT replacement studs sets. Compatible with all TUNIT components This Stud key is compatible with the following boots: F50.6, F50.7, F50.8, F50.9, F50.i adidas F50.6 TUNIT Stud Key - Men's Size: One Size Fits All