Grind Master is a 4 Piece Herb Grinder provides a compact yet thorough herb grinding solution with all the bells and whistles. Advanced engineering was used in designing this 4 piece grinder including a uniquely efficient screen design and concave compartment for catching kief. This high grade aluminum metal grinder is sleek and built to last. Its small 1 5/8” size makes it perfect for use as a portable herb grinder.