TH60-42-5 Electric Turntable Hollow Rotating Platform Gearbox Ratio 5:1 10:1 for 42mm NEMA17 Stepping Motor Input Shaft 5mmIf you've got inquiry to customise the precision ,input and output dimensions, discount ratio,Or you need the 3-D files please write me .PLEASE READ THE FOLLOWING NOTICE BEFORE ORDER:1st:Reduction RatioThe reduction ratio of the planetary reducer you ordered is: 5:1 10:12nd:Input SizeWe will deliver the planetary reducer as the usual measurement as follows:FrameShaft diameter of motormounting flangediagonal Screw hole distance42mm5mm22mm43.8mmIf any query at the measurement of the planetary reducer, please write me the dimension drawing of your motor. We provide customise carrier to your motor and might assist you prefer the acceptable planetary reducer for your motor.3rd:Parameters Here is the parameters of the planetary reducer: