This CRL 48" Production Speed Cutter is a precision tool for simplifying repeat production cuts. It is constructed of lightweight anodized extruded aluminum, which rides on adjustable rollers, for a left or right-handed person. Easy to operate, the Production Speed Cutter is placed on any straight edge of your glass, and then simply run across your glass, making the score. The Cutting Head features a six rotating carbide wheels. The best part is one person does all of the work!