GearWrench 3-3/4"" Engine Cylinder Flex-Hone

Hone engine cylinders 3-1/4"" to 4-1/8"" and 83mm to 105mm in diameter to produce a plateaued finish for fast ring seating and better oil retention for longer engine life;Hone life is in excess of 1000 cylinders;Requires no setup;Use variable-speed 3/8"" electric hand drill and move the Flex-Hone® up and down in the cylinder until desired results are obtained