Rohm PRIMA heavy industrial plain bearing chucks are widely used for stationary and hand operated percussion drilling machines. These industrial quality chucks have fully hardened and ground working components which offer exceptionally high accuracy, gripping power and durability. This Rohm PRIMA13mm Keyed Drill Chuck female mount JAC33 heavy industrial plain bearing chuck is widely used for stationary and hand operated percussion drilling machines. The industrial quality chuck has fully hardened and ground working components which offers exceptionally high accuracy, gripping power and durability.