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: 220mmI.D: 108mmMinimum Thickness: 3mmDisc Position: Rear Fits: Yamaha YFM400 KODIAK 2005-2006 YFM400FA GRIZZLY (AUTO) 4WD 2007-2008 YFM400FG GRIZZLY AUTO IRS 4X4 2009 YFM400FW KODIAK 4X4 2005-2006 YFM450 Kodiak 2005-2006 YFM450FA GRIZZLY AUTO 4WD 2007-2009