THE BUCK 4862 ADJUST-TRU IS A 6-JAW CHUCK WITH AN 8-INCH OVERALL DIAMETER AND A 2-1/4 INCH CENTER HOLE. IT FEATURES A D1-6 BACK MOUNT. THE CHUCK IS IDENTIFIED BY THE PART NUMBER 4862 AND PAT NUMBER 2639157. IT HAS A JAW CAPACITY OF 6, WITH 4 JAWS CURRENTLY PRESENT, AND A PIN CAPACITY OF 6, WITH 0 PINS PRESENT. THIS TOOLING ACCESSORY IS SUITABLE FOR LATHE OPERATIONS.