This Nylon pulley can be used for smooth linear motion on the 8mm width parts. It has a 8mm width groove that can exactly fit our 8mm width beams or rods.Each pulley need 2 Non-Flanged Ball Bearings which are included as pictured.

• Light Nylon material
• Provides smooth linear motion on 8mm width parts, such as Beam0808,and Beam0824,or Gear Rod
• Makes sliding systems virtually friction-free
• Reduces noise