This is not your usual cheap honer, this honer is specifically designed for 2-stroke small engine mopeds and is long enough to bridge the cylinder ports which other honers will not do !
51mm stones, suitable for bores from 32mm to 89mm.
Fits into a regular drill, use with a little WD40 or cutting/ grinding fluid.

A very good quality item and the only one we've seen suitable for 50cc 2-stroke cylinders.