Features: Selected metal, the spindles is durability and have good performances. Spindles is processed with grinding machine for 0.005mm. Great part to DIY drill press, table grinders and so on. Selected with functional craftsmanship, and appearance is very stylish and beautiful. This product is small in size and light in weight, which is very convenient to carry around. Specifications: Component:Bearing Steel Model: ZJZ01012 Speed: 7000rpm Speed Temperature Rise: 60℃ Speed Noise: 2db Cones Hole Runout: 0.001mm Chucks Capacity: JTO：0.3-4mm B10：0.6-6mm B12：1.5-10mm B16：1.5-13mm Rod Length:Approx.106mm/4.17inch Package Includes: 1Pc Connecting Rod 1Pc XL20T 10mm Hole Synchronization Wheel 1Pc 10mm Hole Sliders (including 2 bearing) 1Pc Drill Chucks 1Pc Wheel Wrenches 1Pc Drill Clamps Key note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.