Part number: 41-1660; Performance: krypton flashlight bulb produces 4.8 volts at 0.75 amps, emitting bright light for daily lighting needs Compatibility: replacement bulb is compatible with 3D and 4D lights; constructed with quality glass and metal materials for long-lasting performance Easy installation: flashlight bulbs are simple to install and replace; easily remove old or damaged bulbs and insert new ones without tools or complex steps Size: krypton replacement bulb measures approximately 0.3 cm (0.12 inches) in length; compact design allows for convenient storage What you get: 3 pieces of 4.8-volt 0.75A bayonet base krypton flashlight bulbs; suitable quantity for everyday use and replacements; please verify size and part number before purchase Specifications: Material: glass, metal Part number: 41-1660 Length: approx. 0.3 cm (0.12 inches) Installation guide: Check the correct size and part number Open the flashlight and remove the old bulb Insert the new bayonet base bulb securely Reassemble the flashlight Package includes: 3 x 3D (4D) 4.8-Volt 0.75A bayonet base flashlight bulbs Note: Slight variations in measurements may occur due to manual measurement Keep away from children to prevent choking hazard