Feature: ['Price For: Each Backing Weight: X Item: Quick Change Disc Attaching System: TR Attachment Type: Twist On/Off Grit: 36 Grade: Extra Coarse Color: Orange Backing Material: Fiber Abrasive Material: Ceramic Abrasive Type: Coated Disc Dia.: 3" Max. RPM: 20, 000 Country of Origin (subject to change): United States', 'TR discs have threaded central hubs that require two-and-a-half turns and mount to Norton TR or 3M Roloc TR back-up pads']

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