QuickTrick 4th Gen Slider Alignment System in case. Portable Wheel Alignment to measure caster, camber & toe on any hard surface. Level surface not required. Accurate to within .01 degree on caster & camber, exact on toe in and out. QuickTrick Alignment Slider kits include everything you need with a little extra, to measure all angles. Easy adjustment knobs replace bolt adjusters from 4th Gen non sliders, two frames, 2 digital gauges (Non slider comes with 1 gauge), tape measures, attachment pins and heavy duty dual zipper case with zipper pockets for accessories Sizes are based on the following descriptions: 13-18" Wheels and up to 30" Tires 15-20" Wheels and up to 38" Tires 17-23" Wheels and up to 38" Tires YOu can customize rim and tire size on the website if you need a different set together.