Cylindrical Knobs

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  8 Line Knob Locks

  Grade 1 Heavy duty commericial applications, high traffic areas, commercial and institutional interior and exterior doors

  Government Buildings

  Hospitals

  Commercial buildings

  Schools/Universities
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  6 Line Knob Locks

  Grade 2 Standard duty commercial and residential buildings, interior and exterior doors

  Offices/Warehouses

  Apartment buildings

  Hotel/Motel/Retail

  Residential housing
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  Corbin Russwin CK4200 Series Knob Locks

  Grade 1 Heavy Duty for high-use commercial, industrial and institutional interior and exterior doors

  Hospitals and nursing homes

  Municipal buildings

  Schools/Universities

  Airports
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  Corbin Russwin CK4400 Series Knob Locks

  Grade 2 Standard duty commercial and residential buildings, interior and exterior doors

  Offices

  Apartment buildings

  Hotel/Motel