Good wheel for robotics 2*30mm disc metal wheel is used for DIY and tread with a metal sheet, durable. Can also be used for small turntables. 

Specifications:

• Wheel diameter: 30mm
• Aperture: 2mm (tight with 2mm axis)
• Style: 1 and 2 two styles

Package Includes:
1x 2x30mm disc metal wheel