Moser Engineering Rotor Adapters are made from quality American steel able to withstand demanding racer's needs. Moser Rotor Adapters are available in both a 5 bolt and in an 8 bolt pattern, which will fit both popular rotor designs sold today. Also available in both bolt patterns, is our ultra-light aluminum rotor adapter. Made from aircraft quality aluminum, 7075T6, these adapters not only are light weight but made for endurance.