GearWrench 2486 3-1/2” Engine Cylinder Flex-Hone GearWrench 2486 3-1/2” Engine Cylinder Flex-Hone requires no setup, can be used with a variable-speed 3/8” electric hand drill and move the Flex-Hone up and down on the cylinder until desired results are obtained.

GearWrench 2486 3-1/2” Engine Cylinder Flex-Hone can hone engine cylinders 3-1/4” to 4-1/8” and 83mm to 105mm in diameter to product a plateaued finish for fast ring seating and better oil retention for longer engine life.