This unit is a lamp socket adapter designed to convert a medium/Edison base lamp socket (E26) to a Intermediate base socket (E17). If the light fixture has a medium base socket but the light bulb has a Intermediate base, this adapter is the perfect solution to bridge the gap. Male Side: E26 Edison Medium Base Female Side: E17 Intermediate base Rating: 75W 250V cULus Listed Materials: Phenolic, Brass, Aluminum Height: 1.25 Inch (32 mm) Diameter: 1.02 Inch (26 mm) Additional Details ------------------------------ Product description: This unit is a lamp socket adapter designed to convert a medium/Edison base lamp socket (E26) to a Intermediate base socket (E17). If the light fixture has a medium base socket but the light bulb has a Intermediate base, this adapter is the perfect solution to bridge the gap. Male Side: E26 Edison Medium Base Female Side: E17 Intermediate base Rating: 75W 250V cULus Listed Materials: Phenolic, Brass, Aluminum Height: 1.25 Inch (32 mm) Diameter: 1.02 Inch (26 mm)