150mm Elastic Rubber Castor - Swivel Plate - 300kg Capacity Elastic Urethane The top hole is 9mm

The top hole is 9mm from the top (to the centre of hole)

The 100mm diameter wheel is a elastic rubber compound & has a plain bore with a steel axle bush (no bearing)

non-marking and quiet

Bolt Hole Size: 8

150mm Elastic Rubber Castor - Swivel Plate - 300kg Capacity Elastic Urethane The top hole is 9mmDescription MHB150 P Castor has a heavy duty pressed steel frame zinc plated, twin head race ball bearings with a swivel head seal and a plate mount. Smooth swivelling action, minimum swivel head play and smooth rolling characteristic leading to increased service life due to the special dynamic Blickle riveting process. The 150mm blue elastic rubber wheel is a non marking solid rubber on a impact resistant Nylon 6 rim with a double internal ball