Heavy Duty NEW CYLINDER ENGINE HONE KIT  3-1/2" To 6"  HONING MACHINE  WITH DIAMOND HONING STONES GRIT - FINE 220 + 4 SETS OF MULTI GRIT HONING STONES  320 EXTRA FINE , 220 FINE + 180 MEDIUM + 120 COARSE COMPLETE HONING MACHINE - HONE KIT SIZE – 3-1/2" To 6" / 89 MM TO 150 MM STONES – Coarse 120 (1 SET = 4 STONES) Medium 180 (1 SET = 4 STONES) Fine 220 (1 SET = 4 STONES) Super Fine 320 (1 SET = 4 STONES)