A heavy duty door threshold. The ribbed extrusions can be positioned back to back to provide a two way threshold ramp. Location Door sill or used to provide a ramp frame for internal door mats. Seal Sizes Available in stock lengths. Standard Finish Aluminium anodised 15 microns Satin Clear (silver), Bronze finish. Fixing Method Zinc plated, cross recess head CSK S.T. screws of the appropriate size and colour are supplied. Used in conjunction Raven Door bottom seals. Approvals Access & Mobility AUS/NZ: Conforms to BCA D3 D3.2 and Standard AS1428.1. UK/EU: Conforms to Approved Document M.