-loading capacity: up to 800 lbs. -Installation of this truck rack requires drilling on the bed rail. -It features the extendable top cross-bar which can be adjusted for different size bed width. The adjustable range covers inner bed width from min. 51" to max. 71". -The height is 30.5" to the clearance and 28" to the cross bar. -The upright mounting plate is a flat L-shaped plate with five (5) drilling holes. Pick two (2) that fits your bed rail. -A total of 8 bolts, nuts and washers will be included with the hardware package. -If you would like the non-drill option of using C-Clamps it is an additional $20/$30 depending on your truck. This product will not fit if you have the following with your vehicle: 1.bed covers(tonneau) & camper shells; 2.Inner track systems pre-installed on the inner bed-wall (ex:New Toyota models); 3.Inner bed width smaller than 51"