Best way to install pictures on brick, concrete and cinder block Can hold heavy pictures and other items Leaves tiny minimal marks when removed Extra strength stainless steel pins Lifetime warranty Rocky Mountain Goods Picture Hangers for Brick, Concrete and Cinder Block is the best solution for hanging pictures on hard walls. The stainless steel pins are gently tapped into the hard wall and create a secure hooks for pictures or other items. The extra strength design can hold heavy pictures and comes with a lifetime warranty. When no longer needed only minimal pin hole marks are left that can be easily filled in.