This is the hardened steel nozzle for Kobra 2 Series, it won't work on normal Volcano style hotend.
Hardened steel nozzles are a major upgrade to brass nozzles, as they're tough enough for frequent use of abrasive materials and offer literally years of use without replacement. However, the hardened steel nozzle has a very lower thermal conductivity than the brass nozzles and takes longer to achieve the target temperature. It is recommended to increase the nozzle temperature by around 5°C to 10°C during printing.
Accessories and DIY parts are consumables, they do wear out after a period of time depends on how frequently being used. They also require users with DIY skills to install which might causing damage if not handled properly. We can only provide limited warranty for accessories once it is being used. In case if you have any problem with our products, please read through our Returns & Refunds policy and contact us within 7 working days of receiving your order.