Cylindrical Locks Available with either lever or knob, Corbin Russwin cylindrical locks offer strength and durability for diverse applications like commercial, industrial, and institutional. The CL3100 Series CL3300 Series Extra Heavy Duty Locksets CL33900 Series Electrified Lockset CL3500 Series Heavy Duty Lockset CL3800 Series Standard Duty Locksets CK4300 Series CK4400 Series