ITEM NAME:Valve Lapper 2 Pc Set Cutting Paste Hand Lapping Tool Cylinders Piston Grin K8O3 Valve Lapper 2 Pc Set Cutting Paste Hand Lapping Tool Cylinders Piston Grin K8O3 Sizes: 15mm - 19/32 inch 20mm - 25/32 inch 25mm - 31/32 inch 30mm - 13/16 inch Length - 225mm Place valve lapping compound on valve seat or valve surface as directed by compound instructions. Install valve in to valve guide. Press correct size suction cup firmly on to head off valve. Spin valve lapper tool handle between palms of the hand until a suitable finish is obtained Color: blue + black material: plastic Package Contents:2 * Valve Lapper.Install valve in to valve guide. Press correct size suction cup firmly on to head off valve. Spin valve lapper tool handle between palms of the hand until a suitable finish is obtained. Color: blue + black.