Quick 20 Windshield Repair Kit: Fix Rock Chip, Stone Crack, Star Damage, Bullseye Break & Stone Damage - Rv, Car, Automobile, Truck, Glass & More "Do-It-Yourself" in 20 minutes Repair Automotive Windshield damages Great for Rock Chip, Stone Crack, Star Break, Bullseye Break & Stone Damage Prevents Cracks from Growing Larger and Ultimately Needing Replacement No special tools needed.