This screw almost fit all 40-50 mm rear axle bearing

Very important to avoid small particles to get in the carburettor and cause problems

The wheel have a bearing in the middle so that you can push it easily even with heavy kart as a load

Silicone grips well against both suede

Insexnyckel Usag 5 mm FreightClass-A This screw almost fit allTools for a mechanic is just as important as equipment for the driver. This Allen key from well known Italian Usag is a must in each mechanics toolbox. Chrome plated surface with a burnished tip for exact precision and perfect fit with the screw. The wrench used by most professional mechanics is made of a special Silicon Chrome Vanadium steel as withstand a lot of wear during many years. Allen wrench has three sides which means that you can turn it