The blocks of all Osborn Scratch Brushes are kiln-dried hardwood for maximum tuft retention, even in severe applications. Skilled workmanship assures you of uniform distribution of fill materials and firmly anchored tufts. The wire fill used in Osborn Scratch Brushes provides outstanding cutting ability and offers an extremely high degree of fatigue resistance. The high-quality, staple-set wire provides long effective brush life. Designed for use in hard-to-reach areas that require a narrow face. Smooth machined finish provides excellent comfort in use. Hang-up hole for convenient storage.