Used on many European karts as an OEM axle. 2mm wall thickness, available in Soft, Med, Med/Hard & Hard. Black coated to minimize corrosion. Axle key holes allow for 2 or 3-peg, 7.5mm diameter, 34mm spaced keys. Universally keyed for inboard and outboard drive. Two of each 2-peg and 3-peg key is recommended for most applications. INBOARD holes for KZ/4-cycle is REINFORCED with a sleeve.