Item description from the seller

Heavy Duty
NEW CYLINDER ENGINE HONE KIT 
3-1/2" To 6-1/2" (88 To 163mm) HONING MACHINE 

WITH
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 6-1/2" (88 To 163mm)

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)