Welcome to our shop 1. Sustainable: The aluminum cover provides exceptional strength, good insulation, heat resistance, and corrosion resistance. 2. Size: Diameter 3.9cm, height 5.4cm, center hole diameter 1cm, outer tooth height 2.1cm, outer ring diameter 5.6cm. 3. Electrical specifications: Rated voltage of 250V, rated current of 4A, and heat resistant temperature up to 180C. 4. Versatile Use: Suitable for various lighting fixtures including E27 screw mouth, energy-saving screw, and other E27 screw lights for electric lighting and display headlights. 5. Important Note: Due to buckles on the lamp cap and shell, avoid tightening before installation to allow for easy opening. Please note that there may be slight differences between individual products and images due to factors such as manual measurement and display variations. 100% Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactory after-sales service.