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 works well for 3D or 4D lights; Quality glass and metal materials ensure long-term performance; Easy installation: Flashlight bulbs are simple to install and replace; Replace old or damaged bulbs quickly without tools; Size: Krypton replacement bulb is approximately 0.3 cm (0.12 inches) in length; Compact design allows for easy storage; Keep out of reach of children to avoid swallowing risk; What you get: 3 pieces of flashlight bulb replacements, sufficient for everyday use; Please verify size and part number before purchase; 3 Pieces 6-volt / 4D - 4.8-volt 0.75A bayonet base krypton replacement bulb flashlight bulbs; Specifications: Material: Glass, Metal; Part number: 41-1660; Length: Approx. 0.3 cm (0.12 inches); Installation guide: Confirm correct size and part number; Open flashlight; Remove old bulb; Install new bayonet base bulb; Reassemble flashlight; Package includes: 3 x 3D (4D) - 4.8-Volt 0.75A bayonet base flashlight bulbs; Note: Slight size variations may occur due to manual measurement; Keep away from children to prevent choking hazard.