DRX-3682 mirror arm mount is designed to fit 2013-Up Kenworth T680/T880 trucks. The bracket is constructed of 5 gauge aircraft aluminum and easily attaches to the mirror arm on the driver or passenger side without drilling holes. DRX2390  stud is encased in ABS plastic with a 1" Stainless hex base and 3/8"-24 thread SO239 stud. Driver Extreme square-Lock hardware ensure professional installation, built to provide years of superior performance