This is a knob model that is custom designed for fitting in a cover. On the lower side, there is a circular opening for press fitting to a shaft and used for pulling. The knurling is custom designed based on ergonomics and maximum grip performance.The circular opening on the lower side can be customized according to your needs and the model can also me scaled to fit your needs.You can scale it to match your needs. Along with the native Solidworks file, you can also find parasolid, iges and step formats as well as stl, amf and 3mf. Polygon file is also attached.