Products Catogories Yale Lock Sets Cylindrical Knobset Cylindrical Knob Set Yale door knob-sets are designed in a variety of shapes to provide comfortable door opening solutions that fit your hands. These door knobs are ideal choice for economical users, offering a range of security levels, from heavy duty, to medium to standard, that support a wide range of functions from entrance to internal use. Yale door knobs also feature modern designs with a variety of finishes to suit most décor needs. Yale 5100 - Wafer Lock Yale 5120 - Series Standard Duty Cylindrical Knobset Yale 5220 Series - Medium Duty Cylindrical Door Knobset