which in the manufacturer's documentation is described as "tough" and suitable for universal use

Stainless steel sleeve

Appearance: Transparent violet

Square drive in accordance with DIN 3120 - C 10 and ISO 1174

Tip Treatment: available with Wera Lasertip

Piezo enhed for Pyropen piezo MIL384101111 which in the manufacturer's documentationSpare parts: 80 38U Piezo unit Pyropen Piezo (old version) from WELLER This spare part is the identified piezo unit for older versions of the Pyropen Piezo. The product designation is 80 38U Piezo unit Pyropen Piezo (old version) and is listed as an original spare part from WELLER with the manufacturer's item number T0051619199. Product information Product name: 80 38U Piezo unit Pyropen Piezo (old version) Manufacturer: WELLER Manufacturer's item