3/8" x 1" Cap Screw. Fits: Many New Idea Applications. Massey Ferguson 1306, 1307, 1308, 1309 &1339 Disc Mowers. Challenger HTD7, HTD8, & HTD9 Disc Mower. Hesston 1004, 1005, 1006, & 1007. Also used on White Corn Planters for the Seed Hopper.  #N12798