Navitech Car Windscreen Suction Mount Ball for Garmin Nuvi / N&uuml;vi 2497LMT, 44, 44LM, 42, 2557LMT, 2577LT, 3597LMTHD, 52, 52LM, 54, 54LM, 2757LM, 2797LMT (full 2 year warranty) Full Clip and Lock System to windscreen full ultimate hold (up to 7kg in weight) 360 degree strudy operational head to your Garmin Please note that this is only a mounting head you will need to kindly transfer your clip plate to the ball joint The ball joint is 17mm in diameter Fully under a 12 month warranty