This is a Whiteside dado/plywood bit, model 470, ground for cutting flat-bottom dadoes sized for real plywood thickness. It and uses carbide-tipped cutting edges that resist heat and hold an edge far longer than plain steel.
Chuck it into a router table or handheld router to cut dadoes and grooves sized for undersized plywood so shelves fit snug. The balanced bits run true at speed, so cuts come out concentric and clean with minimal sanding afterward.
Whiteside Machine Company manufactures its router bits in Claxton, Georgia, and is consistently rated among the top-performing router bit makers in independent woodworking tests.
