BIG KAISER Launches Slimmed-Down Milling Chuck for Precise, Powerful Cutting with Ø1/2" End Mills BIG KAISER has launched the HMCJ, a super-slim milling chuck with peripheral coolant supply, designed to support heavy-duty and finish end milling tasks with power and precision using Ø1/2” or Ø12mm cutters. Categories Announcements Tool Holders