Oil cutters - an improved version of the roller. Engine oil is poured into the hollow handle, which is fed through a special channel through the wick to the roller. The lubricant constantly supplied to the cutting element significantly improves the cut quality and repeatedly increases the tool life - up to 6 km. Sharpening the roller loses its meaning, since the entire tool wears out when making a resource. Glasses with a thickness of up to 10 mm are cut with glass-cutters with rollers sharpened under 135 °, from 10 mm to 20 mm under 150 °. For curly cutting glass with a pattern, glass cutters with a rotary holder are used. And special devices from suckers, radial scales and circular holders allow you to cut circles and ovals in glass. Oil cutters of appropriate quality are most suitable for professional use.