6 x 41mm x 1.5mm piston rings for chainsaw models 350 351 352 370 371 390 401 420.This set includes six piston rings designed to fit the specified chainsaw engines.The rings measure 41 millimeters in diameter with a thickness of 1.5 millimeters.Suitable for use as replacement parts in garden maintenance. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.