8mm (0.315") Cylinder Head Flex-Hone for all engine valve guide applications utilizing a 0.295" to 0.320" (5/16" valves) or  7.2mm to 8mm bore.

180 grit

for all engine valve guide applications utilizing a 0.295" to 0.325" 5/16" valves or  7.5mm to 8.2mm bore.

• Brand new sealed in package  engine cylinder head valve guide flex-hone.

•  This is NOT a brush but a hone with abrasive globules that will produce a controlled finish.
  

•  Designed to work with bores from 0.295" to 0.325".
  

• Perfect for materials types, steel, bronze, etc.
  

• Made in USA, by the best cylinder hone manufacturer, FLEX-HONE.

•  180 grit, GOOD for head and valve guide refinishing.
  

• Tool is self centering self aligning
• Can be used with a 3/8" or 1/2" chuck portable drill or drill press

 This patented Flex-Hone is the best way to create a Cross Hatch surface finish with suspended globule working abrasives. 

good for 5/16" diameter valve guides, made in USA

THIS TOOL HAS THE extra long SHAFT for cylinder head  rebuilding.