The 600 Series Is The Ultimate High Performance Disc In The Single Disc Platform. Suited For Both Street And Strip Duty, The 600 Series Will Give You Both The Smooth Engagement And Holding Power You Need To Get The Job Done. This Disc Has A Segmented Semi Metallic Ceramic Facing On Both Sides Of The Disc. Mcleod Racing Offer Various Input Shaft Splines For All The Popular Vehicles In 9-11/16", 10.5",11" & 12" Disc Diameters.