Features: 1.Product Information: St holder fixed base mounting thread is 27mm/1.06in, used for stereo trinocular microscope. 2.Characteristics: Perfect microscope accessories, cylindrical design, exquisite workmanship, with excellent durability stability. 3.Reliable Material: Base is made of high strength aluminum alloy material, which is firm, precise, safe durable, not easy to break. 4.Advantages: The inner precision thread is easy for your daily use, compact structure the kit includes the necessary tools. 5.Professional Manufacturing: This base meets strict production quality stards, stable performance, high reliability, high accuracy. Specification: Item Type: Microscope St Holder Fixed Base Material: Aluminum alloy Mounting Thread: Approx: 27mm/1.06in PackageList: 1 x Base 3 x Screw 3 x Gasket 1 x HexWrench