●BA15S 1156 replacement bulb holder adapter, replacement, retrofit, repair or replacement of LED or incandescent bulbs. ●Compatible lamp size: BA15S 1156. For thread of the bulb P 21 W / R10 W / R5 W. ●Suitable for use at home or in the car workshop. You can use it for turn signal, brake light, tail light, headlight and more. ●Easy DIY installation, just need to be connected and do not need to use any other hardware or anything else when installing, pre-wired for plug and play. ●Please check the product images or videos to make sure this 1156 socket adapter is identical to your original product to ensure proper installation.