Valve Hand Lapping Grinding Tool Kit 2 Piece Set Suction Cup Lap Sticks Features: Heavy duty rubber suction cups. Hardwood handle. Use with lapping compound (not included) to lap valves to match valve seats Specifices: Material: Rubber,Wood Sizes:Large - 1 1/8" and 1 3/8" Sizes: Small - 5/8 & 3/16" Small: 5/8 and 3/16". Large: 1-1/8 and 1-3/8" Use with Lapping Compound (not included) to lap valves to match valve seats. Package Includes: 1x Large - Grip Valve Grinding Stick Lapping Tool 1x Small - Grip Valve Grinding Stick Lapping Tool .