New BRM Flex-Hone Tool Flexible Cylinder Hone 3" Bore Diam BC30032 74-76 mm Works good for most 250cc four stroke bike cylinders but measure before purchasing. •Easy to use cylinder hone that can attach to a standard hand drill or drill press. •Fast and efficient deglazing and finish honing, providing a consistent cross-hatch pattern for oil retention and piston ring seating. •Ball hone style features 320 grit globules of silicone carbide making it perfect for steel sleeved and Nikasil coated cylinders.