We are professional in producing various kinds of slewing bearings.If you have any need or question, please contact me .Thank u! 1.Crossed cylindrical roller slewing bearings: d=398mm-4272mm D=602mm-4726mm H=75mm-174mm 2.Four-point contact ball slewing bearings: no gear：d=398mm-4272mm D=602mm-4726mm H=80mm-174mm internal gear：d=325mm-3322mm D=602mm-3776mm H=55mm-174mm external gear：d=398mm-4272mm D=602mm-4726mm H=80mm-174mm