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High quality: the torsion arm is made of high quality stainless steel with strong endurance properties and good protective device design. The surface is fully treated to resist oxidation and corrosion and maintain a lasting and beautiful shine under light conditions. It is an ideal tool for modification of bicycles. PREVENT LOCKING - The torque arm mount can prevent the motor from coming from the front fork (front) or the frame (rear), and it can also prevent the split shaft from bending or the motor slipping. Ideal for e-bike, mountain bike. Lightweight and portable: the bike torsion arm set is small and lightweight, easy to carry and use. Replace the affected parts while fitting normal motor shafts except for special shafts (the size of the motor shaft does not exceed 14 mm). Versatile torque arms: arm length 86 mm, axle opening 14 mm x 10 mm, C-clamp 14 mm x 10 mm, arm thickness 3 mm, hub mounting thickness 4 mm, C-clamp thickness 3 mm, adjustable according to different configurations. Package: 1 set of torque arm kit includes 1 long reaction arm + 1 short reaction arm + 1 hex bolt + 1 collar + 1 nut + 2 washers (as pictured) Provides your e-bike, engine, AWD bike maximum protection.