✔BA15d Double Contact Bayonet Base and the Diameter of the socket is 15mm. Pins are at the same height. ✔EASY TO INSTALL: No need to distinguish positive and negative electrode of the bulb, directly insert it into the bulb sockets to finish installation. ✔Made with ceramics and anti-fire PC material, fashionable looking, durable and excellent in heat radiation.Transparent PC cover is safety protection and damp proof, LED light bulbs with 400 LM provide 10 times brighter lightness than normal halogen bulbs. ✔Dimmable BA15D led bulbs can adjust the lighting to be bright or dim,dimming range from 0%-100%.Compatiable with most led dimmers,No flicker,no buzzing,they also can be used as non-dimmable bulbs. ✔WIDE RANGE OF USE: use for sewing machine light,pendant light,vacuum cleaner light,reading lamp and desk table floor lamp in living rooms,kitchens,dinning rooms,bedrooms,offices,hallways,ceiling fan light, wall light ba15d