133188 Strip heaters are also known as ST-2401 with these features: 120 volts, 1000 watts, A=23.75 inches, B=22.75 inches, and C=22.25 inches. The overall width of these heaters is 1-1/2", and the height with terminals is 15/16". These strip heaters are 3/8" thick with a chrome steel sheath enclosing the ceramic and internal heater coil. There are two #10-32 terminals in the middle of the heater. These bar heaters come standard with two slots (one on each end) measuring 5/16" by 1/2". They can be ordered without the slots for an additional cost.

Chromalox Strip & Ring Heater Design Guide