The 100mm Aluminium Mecanum wheels (Bush type rollers) allow a robot to achieve omnidirectional movement while supporting large weights.The 4″(100mm)  Mecanum wheel utilize 9 rollers positioned between 2 plates. These mecanum wheels are usually designed for movement in any direction. The rollers translate the force in the rotational direction of the wheel to a force normal to the wheel direction. The Mecanum wheels allow a robot to achieve omnidirectional movement while supporting large weights.The 4″(100mm)  Mecanum wheel utilize 9 rollers positioned between 2 plates. Specifications and Features: Size :4″(100mm) Diameter Thickness of wheel: 50mm Weight: 340 grams. Roller Material: Nitrile rubber Side plates: Aluminum(High-Grade alloy aluminum) Plate Thickness 2.5mm Nut: Nylock Nut Bearing Type used: Single groove ball bearing, Double sealed. Holes for Mounting: PCD 47.5mm Diameter of Holes: 5mm (m5 bolt compatible) Package Includes: 1 x 100mm Aluminium Mecanum wheels (Bush type rollers) Left 3 x m5×65 Allen Bolts for coupling -3pcs. SKU: PGI-002736 Category: Omni wheel (Bearing Types)