description 3.4" (85mm) Professional Flexible Engine Cylinder Hone – 240 Grit Ball Brush for Bores 2.95" to 3.3" (73mm-84mm) Upgrade your engine rebuilding process with this high-quality Flexible Cylinder Hone. Designed for precision, this 240-grit ball brush is the essential tool for creating the perfect cross-hatch pattern on cylinder walls. Ideal for automotive workshops, engine rebuilders, and DIY enthusiasts, it ensures optimal ring seating and oil retention for both professional and hobbyist applications. Features: 1. Precision 240 Grit: The ideal abrasive for finish honing and preparing surfaces for new piston rings. 2. Flexible Ball Brush Design: Self-centering action ensures a uniform cross-hatch pattern and is forgiving for hand-held use. 3. Wide Bore Compatibility: Effectively hones cylinders with bore diameters ranging from 2.95" to 3.3" (73mm to 84mm) . 4. Durable & Reliable: 100% brand new construction designed to withstand the demands of repetitive use in a shop environment. 5. Easy Operation: Designed for use with a standard portable drill or drill press (fits 3/8" or 1/2" chucks). Note on Sizing: This tool measures 3.4" (85mm) in diameter to ensure proper wall contact and effective cutting action within a 3.25" bore. Please confirm your bore size is within the specified range (2.95" - 3.3") before purchasing.