49 x 41 mm

they would need size M based on this measurement result

Suitable for mounting on carbon frames

Praxis forged M30

which can mean a decisive tenth of a second advantage in racing

Topeak Y-Hex Speed Wrench, 4/5/6 mm Fitness-Bike 49 x 41 mmProfessional quality Y shaped Allen keys 2 2. 5 3 mm Allen key made of chrome vanadium steel High tensile strength for reduced wear, longer life and excellent leverage Speed sleeves for more speed and effectiveness when screwing FEATURES Allen key 4 5 6mm Features Speed sleeves, color coding materials Chrome vanadium steel (tools), aluminum fiberglass composite (body) Weight 90g Dimensions 13. 8 x 12 x 1. 7 cm