https://www.crclarke.co.uk/products/strip-heaters/500-and-920-hot-wire-strip-heater

The 500 and 920 Hot Wire Strip Heaters are simple but effective units for the heating of plastic materials up to 5mm in thickness.  They have working lengths of 500 and 920mm respectively.  The guarded heating wire ensures safe operation, while the calibrated side fences allow easy referencing for accurate and repeatable folding.