144B0018 is a idler pulley (2"OD 1/2"B) replacement kit. Compatible with Models ATS211 & ATS211R garage door openers. Check the manual for your specific model number before ordering.
Complete with: Bevel Gear 3/4" ID Hand Chain Guice Hand Chain Shaft Bearing 3/4" ID Nyliner Bearing Compression Spring Chain Wheel Washers Roll Pins and E-Rings