Seed disc opener, 3.5 mm thick blade and Peer 204 series import bearing. Blade is made of super tough boron steel. For John Deere MaxEmerge™, MaxEmerge®2, MaxEmerge®Plus, Pro-Series™; 1530, 1535 drills with MaxEmerge®Plus units. Kinze® planters (standard equipment on 3000, 4000 series). Fits White 6000-8000 series. Plastic dust cap included. Made in USA.