The grids have a special support that allows it to be attached to the paint tin or tub. The Metal scraper grid is suitable for removing excess paint from all rollers or brushes before applying to surface. It is suitable for both beginners and professionals.
11x21cm fits 2.5lt to 4lt Grid fits all sizes tins
22x30cm fits 5lt to 10lt Tubs Grids fits European plastics tubs (Not UK Dulux, 5lt tubs)
26x30cm fit 12.5lt Round or Oval Tubs
I used these all the time in Germany they work so well with Caparol paints and tubs roll straight out of the bucket Metal grids are much better quality than plastic ones.