They have a screw connector and are designed to fit an E10 screw socket.
NUOBESTY 50pcs E10 Screw Base 2.5v Mini Light Bulbs for Flashlight Replacement, Low Voltage Miniature Pocket Bulbs for Student Science Experiments and DIY Lighting Projects
Garneck 50pcs Mini Screw Base Light Bulbs 2.5v E10 Small Light Bulbs for Flashlights with Iron Glass Material, Resistant to Damage, Low Voltage, for DIY Projects and Crafts
TOYANDONA 50pcs 2.5v Miniature Light Bulbs E10 Screw Base Flashlight Replacement Bulbs Small Low Voltage Electronic Test for Student Electrical Experiments and DIY Projects
Healeved 50pcs Mini Light Tester Miniature Screw Base Light Bulbs 2.5v E10 Low Voltage Excellent Illumination Silver Iron Glass for Student Electrical Experiments and Multiple Scenarios
SUNVIE 200W Landscape Lighting Transformer Outdoor Low Voltage Landscape Transformer with Timer and Photocell Sensor Waterproof 120V to 12V/14VAC Low Voltage Transformer for Landscape Garden Lights
EZlumify Low Voltage Waterproof Wire Connectors Outdoor, Waterproof Wire Nuts, Electric Connectors for Wiring, Used for Low Voltage Landscape Lights, AWG 14,16,18,20,22 Gauge Wire, Orange Pack of 30
