2012-2015 Mercedes-Benz ML350 Roof Racks

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

SKU	Name		USD
8-00-9663-BK	EXR 'WEEKENDER-9663' Black Crossbars - (2) 48" Solid bars, 2.46" above Rails	New	485.28
8-00-9766-BK	EXR 'WEEKENDER-9766' Black Crossbars - (2) 51" Click-In bars, 2.46" above Rails	New	631.58
8-00-9766-RD	EXR 'WEEKENDER-9766' Red Crossbars - (2) 51" Click-In bars, 2.46" above Rails	New	716.68
8-00-6667-BK	EXR 'CAMPER-6667' Black Crossbars - (3) 51" Solid bars, 2.46" above Rails	New	859.76
8-00-6767-BK	EXR 'CAMPER-6767' Black Crossbars - (3) 51" Click-In bars, 2.46" above Rails	New	978.5
8-00-6767-RD	EXR 'CAMPER-6767' Red Crossbars - (3) 51" Click-In bars, 2.46" above Rails	New	1112.54
8-00-6668-BK	EXR 'OVERLANDER-6668' Black Crossbars - (4) 51" Solid bars, 2.46" above Rails	New	1151.75
8-00-6768-BK	EXR 'OVERLANDER-6768' Black Crossbars - (4) 51" Click-In bars, 2.46" above Rails	New	1310.07
8-00-6768-RD	EXR 'OVERLANDER-6768' Red Crossbars - (4) 51" Click-In bars, 2.46" above Rails	New	1488.79