Gil Smith Racing Fabrication GSRF-QC-STP180-12 Front Alignment Turn Plate Each set comes with a dry erase marker to mark the "0" degree starting point and directions, if you need them. These are compact and lightweight, only 23 lbs a pair that can be easily fit into your pit box Base Plate is 12" x 12" Top Plate is 11 3/8 inches in diameter Top Plate only rotates 360 degrees Made In USA