Valve guide cleaning brush sets available in nylon and carbon steel. Both 7 piece sets include sizes
1/4�, 5/16�, 11/32�, 3/8�, 13/32�, 7/16� and 1/2� diameters. Overall lengths of brushes are10" or 12" with brush lengths 2� and 2-1/2�. For taking out old metal chips, the grinding compounds, the sludge and the dirt from the oil passageways and valve guides. Carded.