DescriptionThis synchronous wheel is made of aluminum alloy, iron and ABS material, excellently machined, finished smoothly and longer service life. Teeth timing pulley providing a smoother transition between belt, good performance for 3D printers. It is suitable for linear movement and positioning.Features-Material: Aluminum alloy, iron, ABS. -Size: About 1.70X1.70X0.80cm/0.67X0.67X0.31in. -Inner Bores: 3mm. -Teeth Width: 6mm. - Effective wear-proof and rustproof, corrosion resistant, more beautiful and durable. - The idler timing pulley has bearings, high hardness, to ensure the machine runs well. - Widely used in milling machine, gear forming machine, drilling machine, CNC lathe, and more. - These pulley wheels will make a good performance for DIY 3D printers, milling machines, etc. - Exquisite workmanship, reasonable structure, professional and practical, can bring you convenience.