Milling tools for use with E4D® Mill/PlanMill 40. Feature the same faster, cooler cutting, and longer lasting qualities that have made Two Striper diamond instruments the market leader. They are manufactured using the patented P.B.S.® bonding process that maximizes the exposure of the diamond-cutting surfaces. Natural, virgin diamond crystals on Two Striper rotary instruments contain more corners and angles than synthetic diamonds used on electroplated tools.