When it comes to skate boxes and grind boxes, we offer two stock sizes to fit your needs. Both stock skate boxes we offer are 12 Inches high and 36 inches wide. They come built in 6 foot and 8 foot lengths. Our grind rails are 2 inch X 2 Inch black skate steel. All Aura Skateboarding grind boxes are shipped assembled to your doorstep ready to skate.