Feature●STURDY WOOD HANDLE AND HEAVY-DUTY RUBBER SUCTION CUPS hold the cylinder head valve in place while sanding down the surface to match the valve seat●INCLUDES (1) small - 5/8 in. & 3/16 in. and (1) large - 1 1/8 in. & 1 3/8 in.●FOR USE WITH lapping compound (available separately)●USE OF TOOL AND LAPPING VALVES PROVIDES air-tight fitment to prevent intake/exhaust blow by●MUST HAVE TOOL for your engine build arsenalDescription