THE BIGSTEP REFERS TO THE DESIGN OF THE LARGER DIAMETER 'STEPPED EDGE' MEASURING IN AT 58.55MM (+/-0.02MM).
Mark II is a fancy way of saying “version 2” and we like to be different..440C however, is more deliberate. This is a 440 grade stainless steel, and has the highest carbon content for a 400 stainless steel series. It is then heat-treated to reach 43-45 HRC.
This increases the surface area of extractable coffee to be covered, including the prevention of a pinched edge of coffee grind that can occur when using such a large (or incorrectly) sized base. Mainly designed for ridgeless precision baskets ( Example,Pullman Filtration, VST, IMS and Strada, Synesso and some LM baskets ).
It's important to care for your Big Step and protect the base from damage, so it's recommended to store on a soft surface like a rubber tamp seat like our coffee parts one.
As Pullman cannot control the large spectrum of different internal diameters across many brands and weight ratings of precision filter baskets, please note that the BigStep base may not fit in some production batches. We strongly suggest purchasing Pullman Filtration Baskets, which are fitted to the BigStep Base, and are each manually checked for consistency.