Using CRL's Hand Glass Seamer is a quick and easy method to smooth edges and corners of recently cut glass. It removes sharp edges, enabling a glazier to safely handle the glass. By swiping the edges of the glass before washing on automatic glass washers, you can protect the expensive brush bristles. Built-in safety hand guards prevent your hands from slipping. This light, hand-held tool smooths glass from 3/16" to 1/2" (4 to 12 mm) thick.