Bulbtronics Osram Sylvania Halogen Bulb: T2, Light Source: Halogen, Base Style: G4/2 Pin, Burning Position: Universal, CC Temperature: 3200K, Clear, Diameter Outer: 0.25 in., 0.63cm, Filament: CBAR6/C6F/Single Coil Flat/Oval Transverse, For Use With: Microscope, projector, Length: 1.22 in., 3.09cm