Germany style 40 Position Q. Ab is a model between AA and A1. Ab is bigger than AA but smaller than A1. Can be used on BV20, SINO210V, D240, CQ6125 bench lathe which turning diameter is from 180 to 330mm(7″–13″), lathe tool top slide width range 75–100mm. One set A1 includes: 1 X 540-100 tool post and locking wrench. 3 X turning tool holders AbD1665. Can hold 16 MM (16/25″=0.64″) shank turning tool. Can hold tool tip height min. 8 MM (8/25=0.32). 1 X boring tool round tool holder AbH1665. 1 X Tool clmaping T wrench. 1 X English operation manual. 1 X 16X20X80MM Parting Off blade Holder. 1 X 2X12X200MM High speed steel Parting off blade. Gross weight: 3.1KGS. Have sales in USA, etc.