Preheat oven to 200 degrees. In a large roasting pan, melt margarine or butter and Worcestershire sauce. Pour in cereal, pretzels and peanuts. Mix celery salt and onion or garlic powder, and sprinkle mixture over dry ingredients as you put the layers in the pan. Roast for 2 hours, mixing the nuts and bolts every 15 minutes. For best results store in freezer overnight.