Easy to install on windshield / dashboard The ball-and-socket style for easy clip and GPS angle adjustment Base diameter: Approx. 2.2 inch / 5.7 cm Ball diameter approx. 0.67 inch / 1.7 cm Rotate your GPS 360 degree, turn left, right, and tilt up / down Material:Plastic Colour:Black How to use it: Insert ball in the back of the support Remove the bottom of the protective film Fit the cup direct footrest to the windshield or dashboard Then lock Compatibility: Nuvi 2457LMT 2497LMT 2557LMT 2577LT 2597LMT Nuvi 42 42lm 44lm 44 52 54 52lm 54lm package includes: 2 x suction cup Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.