9.52mm
For: MITSUBISHI（三菱）DN-275-20.LT2-240-B.2240-B
      NITAKA（日高）TC2-B875
      SICAMA（安机）(TASICO)LT2-B875
      UNICORN（神马）LT2-H240-BOB
      (corner sewing machine)
      TYPICAL（标准）GC6240B
      HIGHLEAD（海菱）GC20528-B,GC20638