10 Pieces Collar Nut 12 x 1.5 mm Left Hand 4119 642 7600 FS 160 180 220 280 290 300 350 400 This set includes 10 collar nuts with a thread size of 12 x 1.5 mm and a left-hand thread design.The part numbers are 4119, 642, and 7600, compatible with models designated as FS 160, 180, 220, 280, 290, 300, 350, and 400.These collar nuts are designed for secure fastening in specific mechanical applications requiring left-hand threading.Each piece is made to meet standard specifications for fit and function.This is a non- replacement.Any reference to brand names or models is strictly for compatibility purposes.