【2 Extension Tubes】Combined of 2 different metal extension tubes, including 12mm + 24mm, the automatic extension tubes can be used separately(12mm/24mm) or in combination(12mm+24mm) for different focal length. | 【Electric Pins】Built-in electric pins, superior lock pin which can tighten the tube joint, to make photographic activities at closer distance with higher magnification, to achieve macro effect with excellent photo quality. | 【Multifunctional】Support camera TTL, autofocus function and EXIF information transmission, only shooting according to actual photometric conditions, which is really convenient for user. | 【Lightweight】High quality and compact machining, net weight only 151g/ 5.32oz which is super lightweight and portable. | 【Durable】These extension tubes offer lightweight durability, with metal mounts that provide additional robustness that will stand up to switching between lenses and other tubes for long-lasting use.