Check the listing for details. Plaziflex Plastering Rendering Replacment Trowel Blade 18x 1/2" Flexiback Refina. Color: BLACK, Condition: New, Made in Germany. Listed at 43.22 USD. The highly anticipated Interchangeable Blade System is easy to use, requires no tools and is self-locating thanks to a unique notch on the blade and X-SKIM handle. This allows you to change the blade to suit the application and even swap out damaged Edges with ease - great if you tackle dry-lining, plastering, and rendering applications regularly. The 1.5mm gauge plastic finishing spatula blade provides a faster and flatter finishing of plaster surfaces thanks to not needing additional water during the final plastering stages. Plastic Edges offer a lighter working experience and are excellent when used on large, curved surfaces achieving a superior finish throughout thanks to ensuring no distortion is present throughout the entire length of the blade. Evenly distributed pressure is key whe.