Combine the sour cream, mayonnaise, horseradish, Worcestershire sauce, salt, garlic powder and salt in a medium bowl, stirring until evenly combined.
1 1/2 cups sour cream, 1/2 cup mayonnaise, 2 tbsp horseradish, 1 tbsp Worcestershire sauce, 1/2 tsp salt, 1/4 tsp garlic powder, 1/4 tsp pepper