Valve lappers are used for hand lapping valves, This is another quality product brought to you by Lisle, Thick handles for easy lapping, 1-1/8"" and 1-3/8"" Diameter cups for larger valves, Unique locking tab positively secures cups to sturdy handles, Eliminates slippage, Skin-packed, Dimensions: 10, 5"" x 3, 6"" x 1 "", SKU: DOBA8517