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: 218mmI.D: 105mmMinimum Thickness: 3.5mmDisc Position: Rear Fits: Polaris ACE 570 HD 2016-2018 ACE 570 HD EPS 2018-2021 RANGER 500 2X4 2005 RANGER 500 4x4 2004-2005 RANGER 500 6X6 2004 SPORTSMAN 400 4X4 2005 SPORTSMAN 400 4x4 2003-2004 SPORTSMAN 450 2006 SPORTSMAN 500 4X4 HO 2005-2008 SPORTSMAN 500 EFI 2006-2007 SPORTSMAN 500 HO 4x4 2003 SPORTSMAN 600 4x4 2003-2005 SPORTSMAN 700 4x4 2002-2004 SPORTSMAN 700 MV7 2005 SPORTSMAN 800 EFI 2005-2007