RGM Painting Knife Plus #051 RGM Painting Knives from $5.56 $9.15 Qty. Add to Cart SKU: RGQ051 This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Length: 2 1/2" Width: 9/16" (6 1/2cm x 1 4/10cm).RGM Painting Knife Plus #51 with dark brown bubinga wood handle. Tweet