Studs made of various types of metal for an aesthetic finish when fitting a warning strip for partially sighted or blind people. 25 mm dia. x 5 mm thick. Micro striations for enhanced non-slip properties - 0.39 SRT coefficient.Drilled nails for optimum fixing, particularly on carpets where an adhesive or glue-in nail is not suitable.Use template ref 4374 with 6 mm dia. holes. supplied with screws but without plugs.