CRC 05109 0.5 Ounces Technician Grade Di-Electric Grease with Precision Tip Applicator Seals, protects and insulates electrical contacts and bulbs. Prevents corrosion by repelling moisture, dirt and oils that can penetrate and harm electrical connections. Precision Tip Applicator applies a thin stream of grease directly on the work area. Improves electrical performance. Reduces arcing and voltage drop.