... 3/4" bore size 3/16" keyway FENJIN 20 series torque converter driver is a symmetrical inline small engine clutch ... that replaces Max Torque 20 Series Torque Converters, and works with 3 - 8 hp engines within ... 3/4" shaft, 3/16" keyway.Specifications:3/4" 20 Series Torque Converter Drive, 3/16" keywayBelt: Symmetrical typeEngagement range: 1850 ...