Check the listing for details. Arbortech Ball Gouge Grinder Attachment. Condition: New. Listed at 141.98 USD. Arbortech Ball Gouge Grinder Attachment, 164581, Spherically shaped grinder attachment that can rapidly hollow small concave surfaces in woodworking projects, Ideal for small to medium sculpting projects, Features Anti-Grab Technology, Creates chisel-like texture, This Arbortech Ball Gouges is a spherically shaped grinder attachment that can rapidly hollow small concave surfaces in woodworking projects. It is specifically designed to provide exceptional control, balance and performance in freehand wood shaping and carving. The 30mm diameter ball-shaped cutter is ideal for carving smooth hollows in wooden spoons, small bowls and is useful for small to medium sculpting projects. It gently bounces out and creates a chisel-like texture when moved across a wooden surface. Anti-Grab Technology.