  
Our new Modular Screw Chucks feature interchangeable size screws. Each Screw Chuck is supplied with 3 different screw size inserts with screws, 1/4”, 5/16” and 3/8”. The Inserts can be changed by simply loosening a set screw and inserting a different insert. Any 1/4”, 5/16”, or 3/8” Hanger Bolt can be used with this chuck (available at most Hardware Stores).
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