The listing is for 220V Brand New CLEAR PUSH IN LED LIGHT BULBS that fits many Home Sewing Machines using Push In Light Bulb type.

Base 15mm, ( 5/8")
Length about 50mm (2") 
2.5W
64 LEDs
Long life
Push in / Bayonet type
Bright White LED light.  
Save on energy.

fits Singer Serger 
14CG744 / 14CG754 / 14J334 / 14SH644 / 14SH654 / 14SH744 / 14SH754 / 14U344 / 14U354B 

and other Home Sewing Machines using Push In Light Bulb type.