2006-2012 Mercedes-Benz GL Roof Racks

What's the difference between Solid vs Click-In Crossbars?

SKU	Name	USD
null	EXR 'WEEKENDER-8673' Black Crossbars - (2) 48" Solid bars, 1.76" above Rails	378.92
8-00-5677-BK	EXR 'CAMPER-5677' Black Crossbars - (3) 51" Solid bars, 1.76" above Rails	716.62
8-00-8776-BK	EXR 'WEEKENDER-8776' Black Crossbars - (2) 51" Click-In bars, 1.76" above Rails	743.19
8-00-5777-BK	EXR 'CAMPER-5777' Black Crossbars - (3) 51" Click-In bars, 1.76" above Rails	785.8
8-00-5678-BK	EXR 'OVERLANDER-5678' Black Crossbars - (4) 51" Solid bars, 1.76" above Rails	843.09
8-00-8776-RD	EXR 'WEEKENDER-8776' Red Crossbars - (2) 51" Click-In bars, 1.76" above Rails	853.11
8-00-5778-BK	EXR 'OVERLANDER-5778' Black Crossbars - (4) 51" Click-In bars, 1.76" above Rails	935.33
8-00-5777-RD	EXR 'CAMPER-5777' Red Crossbars - (3) 51" Click-In bars, 1.76" above Rails	1073.47
8-00-5778-RD	EXR 'OVERLANDER-5778' Red Crossbars - (4) 51" Click-In bars, 1.76" above Rails	1318.89