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: 292mmI.D: 50.5mmMinimum Thickness: 5mmDisc Position: Rear Fits: Harley Davidson FLSTC SOFTAIL HERITAGE CLASSIC 1987-1999 FLSTF SOFTAIL FAT BOY 1990-1999 FLSTN SOFTAIL NOSTALGIA 1993-1996 FLSTS HERITAGE SPRINGER 1997-1999 FXD DYNA SUPER GLIDE 1995-2003 FXDL DYNA LOWRIDER 1993-2000 FXLR DYNA LOWRIDER CUSTOM 1987-1994 FXR DYNA SUPER GLIDE 1986-1994 FXRS DYNA LOWRIDER CONVERTIBLE 1988-1994 FXRT DYNA SPORT GLIDE 1987-1992 FXSTB SOFTAIL NIGHT TRAIN 1999 FXSTC SOFTAIL CUSTOM 1987-2006 FXSTS SOFTAIL SPRINGER 1988-1999 XLH1200 SPORTSTER 1988-1999 XLH883 SPORTSTER 1988-1999