Heavy DutyNEW CYLINDER ENGINE HONE KIT 1-3/4″ TO 2-1/2″ (45MM TO 65MM) HONING MACHINE WITH5 SETS OF MULTI GRIT SILICON CARBIDE Stones (VITRIFIED BOND) 400 ULTRA FINE320 EXTRA FINE220 FINE180 MEDIUM120 COARSE COMPLETE HONING MACHINE – HONE KIT SIZE – 1-3/4″ TO 2-1/2″ (45MM TO 65MM) 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)ULTRA Fine 400 (1 SET = 4 STONES)