HomeChucksPatriot Chuck SystemPatriot ChucksChuck Exerts Chuck Exerts Robert Sorby Chuck Exerts for Larger Threads. These all enable the standard Robert Sorby Patriot Chuck insert version chucks to be adapted to fit larger headstock threads. Categories: Chucks, Patriot Chuck System, Patriot Chucks Find a Stockist Additional Information Warranty Part No. Size Cat Page Number LEXW EXW-Chuck Exert 1.3/8" X 6" LEXH EXH-Chuck Exert 1.1/2" X 8" LEXMH EXMH-Chuck Exert 1.1/2" X 6" LEXN34 EXN34-Chuck Exert 33mm X 3.5mm Robert Sorby tool sets now come with a lifetime guarantee. Simply follow the link below and complete the registration form, ensuring that you include the set’s registration number. You will find this on the warranty card that came with your tool set. Note: this warranty does not cover wear through natural usage or damage caused by misuse or negligence. Please retain your receipt as proof of purchase. Register your product Share this on: Related products Deep Grip Jaws (RSJDG) 2¾” (70mm) Jaws (RSJ3) Deluxe Hollow Revolving Centre 1mt. (DRC/1) 4¼” (108mm) Jaws (RSJ5)