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: 275mmI.D: 56mmMinimum Thickness: 4.5mmDisc Position: Front Left Fits: Suzuki GN250 1982-2007 GS1000 1980-1981 GS1100 1982-1985 GS550E 1981-1982 GS550M KATANA 1981-1983 GS650G KATANA 1981-1984 GS850G 1982-1984 GSX1100S KATANA 1981-1984 GSX750S KATANA 1982-1985 RG250F 1986-1987 RG250W 1983-1984