Place the skirt steaks in a nonreactive baking dish in a single layer. Combine the chili powder, coriander, salt, cumin, garlic and onion powders, and black pepper in a small bowl and mix well. Sprinkle this mixture over the meat, patting it on with your fingertips. Let stand for 10 minutes. Squeeze the limes over the meat. Let marinate in the refrigerator for 30 minutes