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: 174mmI.D: 53mmMinimum Thickness: 2.5mmDisc Position: Front Left or Right Fits: Honda TRX250EX SPORTRAX 2001-2013 TRX250R 1988-1989 TRX250X 1987-1992 TRX300EX SPORTRAX 1993-2008 TRX300X 2009 TRX400EX 2WD SPORTRAX 1999-2007 TRX400X 2012-2014 TRX450ER 2WD 2006-2011 TRX450R 2WD 2004-2009 TRX700XX 2008-2013