FOR UNIVERSAL KIT & CLASSIC CAR WITH 3/4" BORE. Bore 0.75” Moves 2.85cc of Fluid per 1cm of piston travel. Girling type cast Aluminium Brake or Clutch Master Cylinder. Kit Car or Classic Car. High Quality ETL/CSA/CE/NSF/FCC - We passed every evaluation of pool products, even ASTM which for pool alarm in USA laboratory.