Hardened and precision ground. Big clamping force and wide clamping range. ER straight rod type collet extension handle, the handle body is relatively long, suitable for deep hole processing. Can reduce the use of tools, reduce costs, improve efficiency. The outer diameter of the rod and other parts of the rod can be eliminated by precision grinding, which can the unbalance and increase the stability of the cutting. High strength and hardness. Performance stability, high accuracy. Used in machining centers, universal milling machines, CNC milling machine, engraving machine, high-speed machines, and other processing. Stable and reliable performance Easy disassembly type Easy to clean and maintain. Excellent quality and long service life Micro, compact and Save electricity Environmental protection Exquisite manufacture. Product Name: 775 DC Motor Speed: 4000~12000 rev/min;Motor Diameter: 45mm;Motor Step Height: 5mm;Motor Stepped Diameter: 17.4mm; Motor Length: 67mm (excluding shaft) Shaft: 5mm; Motor Shaft Length: 16mm;Terminal Spacing: 34mm;Mounting Hole Pitch: 29mm Installation Hole Diameter for 1610/ 2417/ 3018 CNC Router Machine(It is recommended to use 12-24V for longer life) Product Name:ER11 Motor Shaft Degree: 15;Shank Diameter: 3.175mm(1/8inch);Total Length: 30mm The Correct Method Of Mounting The Collet Nut:1.Put the chuck into the pressure cap,gently turn the clamp spring, when eccentric portion of the pressure cap recessed clamp spring grooving.Along the direction and use equal force to push clamp spring, can mount pressure cap.2.Put the clamp spring and cap all together installed on the chuck body or spindle.Insert into the clamping.hole after wipe the cylindrical shank,use a wrench to tighten the pressure cap,until clip firmly the tool before use.(Note: Avoidfastening pressure cap that not installed tool, to avoid damage the clamp spring).3.Use a wrench to loosen the pressure cap and took out the chuck or tool, remove the tool.Along the direction of the push out the clamp spring.Then according to need replace other clamp spring. colour: silver Material: metal Package Contents: 1 x DC motor 1 x spring collet 1 x ER11 motor shaft 1 x PCB engraving position Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.