2008-2010 Mercury Mariner Roof Racks

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

SKU	Name	USD
8-00-9660-BK	EXR 'WEEKENDER-9660' Black Crossbars - (2) 40" Solid bars, 2.46" above Rails	471.83
8-00-9760-BK	EXR 'WEEKENDER-9760' Black Crossbars - (2) 40" Click-In bars, 2.46" above Rails	711.35
8-00-9661-BK	EXR 'CAMPER-9661' Black Crossbars - (3) 40" Solid bars, 2.46" above Rails	829.45
8-00-9760-RD	EXR 'WEEKENDER-9760' Red Crossbars - (2) 40" Click-In bars, 2.46" above Rails	838.55
8-00-9761-BK	EXR 'CAMPER-9761' Black Crossbars - (3) 40" Click-In bars, 2.46" above Rails	926
8-00-9761-RD	EXR 'CAMPER-9761' Red Crossbars - (3) 40" Click-In bars, 2.46" above Rails	1216.87