Specifications of 4th Axis: Center Height: 65mm (2.56"); Total Height:; 115mm (4.5"); Angle: 0.3°/Step ; Reduction Ratio: 6:1; Base Material: Aluminum Alloy; Size:210x168x115mm (8.3x6.6x4.5"); Weight: 7.7 KG (17 LB); Inner through hole diameter/shaft hollow diameter is 22 mm (0.86") Specifications of Stepper Motor: Phase: 2 Phase; Type: Nema23 Hybrid; Step Angle: 1.8 degree; Current: 3A; Holding torque: 270oz-in 180N.cm; Shat Diameter: 8mm; 4 Lead Wires: A+ to Red ; A- to Green ; B+ to Yellow ; B- to Blue; Motor Size: 57x57x76 mm Specifications of MT2 Tailstock: Morse Taper 2 Live Center Movable MT2 Tailstock; Center Height: 65 mm(2.56"); Expansion stroke: 45 mm(1.77"); Stretch distance: 50 mm(1.97"); Top tip: Activity type; With Axial locking wrench for tailstock; Exquisite workmanship,Durable,Stable performance,Sturdy and Wear-resistant; Weight: 2.5 KG(5.5 LB) Chuck Type: K11-100 3 Jaw self-centering chuck; Diameter:100mm(3.93"); Max input torque: 60 N.m; Max Speed: 3500 r/min; External jaw clamping range: 30-80mm(1.18-3.15").; Internal jaw clamping range: 2-30mm(0.08-1.18"); Internal jaw jamming range: 30-90mm(1.18-3.54");With 3 Anti-claw and Wrench Advantages: Rust proof coating process, stable chuck structure, fine workmanship, solid and practical jaw, excellent process to maximize service life; Applications: The 4th axis can be used for three-dimensional processing of cylinders, bends and circles,cnc router,milling machine,engraving machine and carving machines etc, Weight: 0.9700339528 pounds, Manufacturer: Changzhou Rattm Motor Co.,Ltd