38mm (1.5") long reach angled paint brush - Amtech
Amazon.com: Amagic 9Pcs Angled Flat Tipped Art Paintbrush Set with Storage Container - Anti-Shedding Synthetic Nylon with Long Handle - Paint Brush for Watercolor, Acrylics, Ink, Gouache, Oil, Tempera
Premium 1 in. Polyester Trylon Thin Angled Sash Paint Brush HD 3610 N - The Home Depot