Mash garlic and salt together in large bowl. Mix together with minced rosemary and oil and then add shrimp. Let it set in refrigerator for at least 1 to 2 hours.
Preheat grill. Place 4 shrimp on each skewer. Brush with oil. Cook shrimp on an oiled rack for 3/4 mins on each side, or until just cooked through. Shrimps start appearing pink and becomes soft. Its, ready to grab the yummy taste.