Replacement belt compatible with Simplicity models 166172, 166172SM, 1664457, 1664457SM. Size: 1/2inch x 41inch. Why you need this belt Restores proper power transfer between pulleys to stop slipping and uneven operation. Direct replacement sized to match original equipment dimensions so fit and alignment are maintained. Keeps equipment running reliably during routine use and seasonal work. Key features and attributes Function: replacement drive belt designed to transfer motion and torque between pulleys for cutting decks and drive systems. Compatibility: specified for models 166172, 166172SM, 1664457, 1664457SM. Verify model numbers and belt length before . Size: 1/2inch x 41inch for accurate fit. Performance: engineered for consistent belt tracking and predictable tension when installed to factory specifications. Practical applications a cracked, glazed, or stretched belt during spring maintenance to restore smooth operation. Install as part of a deck to eliminate slipping under load and ensure even blade speed. Keep as a spare on long mowing days to minimize downtime if a belt fails in the field. Installation tips Compare the belt length and width to the removed belt before installation. Follow equipment manufacturer guidelines for routing and tensioning. Inspect pulleys and idlers while replacing the belt for wear that can shorten belt life. this compatible replacement belt to maintain reliable operation of the listed equipment models.