M:Part Torx Rotor Mount Kit The M:Part Torx Rotor Mount Kit comprises: 6 hardened M5 stainless steel bolts designed to fit any 6-bolt disc brake rotor. Each bolt is threadlock treated to help prevent them loosening off. Each bolt has a low-profile mushroom head, designed to offer maximum clearance. Each bolt has a torx head to allow extra leverage, and hence a secure fit. Supplied with Torx key.