This is a lamp holder adapter made of aluminum alloy material. It has a scientific design and practical functions. The easy- to- install metal adapter can two photographic with different size holders ( 1/ 4 And 3/ 8 ). Fine workmanship, efficient and practical, useful camera screw suitable for your photography settings, will serve you very well. Features - Color: As shown. - Material: Aluminum Alloy. - Size: About 7. 00X2. 00X2. 00cm/ 2. 75X0. 79X0. 79inch. - Preferred materials,, safe, durable and practical. - Suitable for 1/ 4 or 3/ 8 tripods, monopods, quick release boards, stands, light towers and photographic. - The structure is reasonable, convenient and practical, and easy to install. Just screw in the screws to quickly install the photographic accessories. - The conversion screw can meet the requirements of most of your camera and accessories. - Fine workmanship, good texture, high adaptability and practicability will bring you a better experience. Package list: 6 x Screw Adapters