We have 32 seed openers brand new never used. Ordered in for a guy but ended up being wrong blades had to order a different set. They are 15” 3.5 mm thick heavy duty bearing with dust caps Replaces John Deere AA20242 AA37474 Kinze GA2013 white 852063These fit John Deere 7000, 7100, 7200, 7300. Max emerge, max emerge2, max emerge plus, pro series Kinze prior to 1999 series White 6000 series John Deere 1530, 1535 drills with max emerge plus units