Oregon® Pro-Am Guard Mate® Guide Bars 18” are bars for the semi-pro and occasional woodcutters using small to mid-size saws with .325” or 3/8” chains. These 18” in length, Pro-Am Guard Mate® bars have a sprocket nose with Guard Mate® holes and slim-symmetrical contour that is light in weight, maneuverable, and reversible for long life. Available in a variety of lengths, gauges, bar mounts and more. Recommended saw sizes: Up to 3.5 cu in (57). Pro-Am Guard Mate® bar feature choices include: Lubri-Dam® - an oil-retaining feature that increases oiling efficiency while reducing oil-hole plugging. Lubri-Dam oiling features may not be a standard feature on certain bars depending on the date of manufacture of bar type.