This is a branded product offered exclusively by Scintiluna LED. Other sellers using this listing may offer a similar product, but their accuracy to our description cannot be guaranteed! This handy little adapter will convert a standard BA15S (Single Contact Bayonet) type socket to a G4 base. Please consult our BA15/BAY15 chart above to see if this base type will suit your needs. These adapters are not recommended for use with halogen lamps. **Note that 5 adapters are included with a single order.