Cone end slips OVER your M10x1.25 thread shift lever and lets you use any 1" BMX or Moto grip as a shift knob. In other words the m10 thread is on center of this part. M8p1.25 thread on the flat end sits ON TOP of m8 shift levers, so when the flat end is down this part will be higher therefore if extra height was desired for m10 or m12 cars you would need to drill and tap that m8 end. The internal m10 thread could be drilled and tapped to m12 when a lower height is desired for m12 cars adapting this universal part. ~CNC aluminum with Black EPD coating