The UNRVLD Medium Bore Ball Hone Kit covers the practical 16, 18 and 20 mm sizes in a 320-grit silicon-carbide finish.
 
Designed for workshop repair work involving small hydraulic bores, calipers, master cylinders, slave cylinders and similar applications. The flexible abrasive-ball design follows the bore to help remove light glazing and restore an even crosshatch pattern.
 
Features:
Includes 16 mm, 18 mm and 20 mm 320-grit hones
300 mm overall length
16 mm hone suits 13–16 mm bores (0.50–0.625 in)
18 mm hone suits 16–19 mm bores (0.625–0.75 in)
20 mm hone suits 19–22 mm bores (0.75–0.875 in)
 
 
Ball hones are intended for light deglazing and surface refreshing only. They are not a substitute for precision boring and honing equipment. Always measure the bore, follow the piston-ring manufacturer’s finish requirements, use suitable honing lubricant, and thoroughly clean the bore before assembly.