2007-2013 Chevrolet Avalanche 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	488.35
8-00-9766-BK	EXR 'WEEKENDER-9766' Black Crossbars - (2) 51" Click-In bars, 2.46" above Rails	745.39
8-00-9664-BK	EXR 'CAMPER-9664' Black Crossbars - (3) 48" Solid bars, 2.46" above Rails	854.23
8-00-9766-RD	EXR 'WEEKENDER-9766' Red Crossbars - (2) 51" Click-In bars, 2.46" above Rails	855.31
8-00-9767-BK	EXR 'CAMPER-9767' Black Crossbars - (3) 51" Click-In bars, 2.46" above Rails	1077.13
8-00-9767-RD	EXR 'CAMPER-9767' Red Crossbars - (3) 51" Click-In bars, 2.46" above Rails	1242.01