MTX solid discs are constructed using one complete segment of Japanese SUS 420 stainless steel then heat-treated to HRC 36+-2. Lightening and drill hole patterns are as per OEM designs to improve braking performance and reduce the temperature of the disc.MTX Discs provide amazing braking control for your motorcycle. All MTX discs are designed and manufactured with world-leading cutting edge technologies:Precision CNC machined and laser-cut technologyJapanese SUS 420 Stainless SteelReplacement for Original EquipmentOEM Design; lightening & drill hole patternsSpecifications:O.D: 316mmI.D: 184mmMinimum Thickness: 6mmDisc Position: Rear Fits: Honda GL1500 GOLDWING L/SE 1990-2000 GL1500C VALKYRIE 1997-1999 GL1500CT VALKYRIE TOURER 1997-1999 GL1500I INTERSTATE 1991-1996 ST1100 1990-2002 ST1100 ABS 1992-1995