The M3 version is compatible with MAHLKÖNIG’s E65S & E65S GBW. grinders. Nano non-stick tamp head reduces coffee build up. New advanced stiffer frame provides further precision and life span. New easy adjustment wheel simplifies correct setup. The new updated design now works perfectly with naked portafilters. Force adjustment: steps of 1kg in the range of 5-30kg Suitable for all types of portafilters, naked, single and double.