Seed opener assembly, leading. 14" diameter, 4.5 mm thick.Used on Case-IH 800, 900, 950, 955, 1200 series planters; 5400, 5500 Soybean Special drills.* Includes heavy 205 series single row bearing, 5/16" diameter rivets.* Mounts with 5/8" x 2" bolt * Planters built 2013 & after use the 205 series single row bearing with triple lip seal as original standard equipment. * Earlier planters can be updated to this blade using 5/8" x 2" bolts sold separately.