The IS-205 is an extremely powerful vane type motor which is compatible with all e-type contra angles and adaptors which do not require water, or fiber optics. This one will last a long time before needing repair. NSK uses sealed bearings, viton o-rings, and composite blades in this air driven motor which make it highly resistant to the torture of the autoclave cycle. Once again, NSK produces a superior product at an entry level price.