133137 Strip heaters are also known as ST-1205 with these features: 240 volts, 500 watts, A=12 inches, B=11 inches, and C=10.5 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