American-style cabinet saws generally follow the model of the Delta Unisaw, a design that has evolved since 1939. Saws of this general type are made in the US and Canada, or are imported from Taiwan and China. The most common type of rip fence mounted to this type of saw is characterized by the standard model made by Biesemeyer (now a subsidiary of Delta). It has a sturdy, steel T-type fence mounted to a steel rail at the front of the saw and replaceable laminate faces. American cabinet saws are normally designed to accept a " wide stacked dado blade in addition to a standard saw blade. The most common size of blade is 10" in diameter with a blade arbor diameter of ", but 12" or 14" in diameter with a blade arbor diameter of 1" are found in commercial/industrial sites. American saws normally include an anti-kickback device that incorporates a splitter, toothed anti-kickback pawls and a clear plastic blade cover. The saw blade can tilt to either the left side or right side of the saw, depending on the model of saw. The original Delta Unisaw and early cabinet saws based on it were all right-tilt units while newer Delta Unisaws and many competitive cabinet saws made after 2000 were left-tilt saws. The change to left-tilt was due to a lower perceived propensity for the cut piece to become trapped between the rip fence and blade and kick back when the blade tilts away from the rip fence (left tilt saw) versus towards the rip fence (right tilt saw.) While conceptually simple in design, these saws are highly evolved and are capable of efficient, high volume, precision work.