Riser bars for spiral staircases, 12pcsEnsure safety and compliance with UK Building Regulations using the riser bar kits for Calgary and Montral spiral staircases. These kits are designed to be mounted under the treads, effectively closing the gap between them and preventing accidents. The riser bar kit is an essential safety feature, particularly for primary staircases, as it ensures the gap between treads does not exceed 100mm, meeting the UK safety requirements. Available in three