Features: Material: The whole body is made of aviation aluminum, which is oxidized and has a beautiful appearance. High precision, exquisite craft, smooth surface. Long life, low coefficient of friction, high versatility. Linear motion, with a small frictional resistance. Linear shaft diameter is 16mm/0.6inch, and the effective stroke is 100mm/3.9inch. Specifications: Max. load:<20kg Linear shaft: 16mm(diameter) Motor standard: NEMA23 Step Motor(Need to be purchased separately) Repeat locating standard: ±0.03 Effective stroke: 100mm / 3.9inch Package Included: 1 x Sliding Table