Bolt hole castors with a Heavy Pressed Steel castor bracket, fitted with a Nylon wheel. These bolt hole swivel casters range from 100mm-250mm and have a capacity up to 800 Kg per caster. Solid Nylon Wheels with are most often white and ball bearings centred wheels as an alternative are available. Nylon is less friendly to floors but do offer incredible load capacity compared to many other wheel materials. They are light in weight and very hard wearing and priced competitively but care must be taken when selecting due to nylon having an aggressive effect. We believe when nylon wheels are expected to be under high loads that ball bearing centred should be ordered this helps the user experience and greatly reduces bracket stresses which help problem castor life. ough alternative colours are available, less friendly to floors but do offer incredible load capacity compared to many wheel materials. They are light in weight and very hard wearing and priced competitively.