Oregon® Pro-Am Double Guard 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 Double Guard bars have a sprocket nose and slim-symmetrical contour that is light in weight, maneuverable, and reversible for long life. Double Guard bars have a small radius nose that helps reduce kickback energies. Available in a variety of lengths, gauges, bar mounts and more. Some Double Guard Guide Bars have PowerSharp® bar mount chain sharpener holes. Recommended saw sizes: Up to 3.5 cu in (57). Pro-Am Double Guard 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.