HomeChucksDrives and CentresInterchangeable Revolving CentresHollow Ring Centre (RC516HC) Hollow Ring Centre (RC516HC) For hollow boring, it allows a 5/16″ shell auger to feed through precisely ensuring accurate boring. Categories: Chucks, Drives and Centres, Interchangeable Revolving Centres Find a Stockist Additional Information Warranty SKU Code Description/Type Cat Page Number LDRC516H Hollow Ring Centre 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 Chuck Inserts 4¼” (108mm) Jaws (RSJ5) Stebcentres (STB) Compatriot Chuck (RSPCOM)