2005-2015 Nissan Xterra Roof Racks

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

SKU	Name	USD
8-00-7670-BK	EXR 'WEEKENDER-7670' Black Crossbars - (2) 40" Solid bars, 1.76" above Rails	376.52
8-00-7770-BK	EXR 'WEEKENDER-7770' Black Crossbars - (2) 40" Click-In bars, 1.76" above Rails	534.24
8-00-7671-BK	EXR 'CAMPER-7671' Black Crossbars - (3) 40" Solid bars, 1.76" above Rails	685.46
8-00-7770-RD	EXR 'WEEKENDER-7770' Red Crossbars - (2) 40" Click-In bars, 1.76" above Rails	699.34
8-00-7771-BK	EXR 'CAMPER-7771' Black Crossbars - (3) 40" Click-In bars, 1.76" above Rails	756.92
8-00-7771-RD	EXR 'CAMPER-7771' Red Crossbars - (3) 40" Click-In bars, 1.76" above Rails	1004.57