CMZST260H Replacement Spring Compatible with Craftsman Qucikwind Weedwacker CMCST920 CMCST960 CMCST960E1 Type 1,CMCST920M1 Series Cordless String Trimmer Replacement Craftsman String Trimmer Spool Head Cap and Spring Made of high quality material, durable and practical to use Turn off the trimmer before changing, installing, or removing the spool head Quality Assurance:If you have any quality problems, please feel free to contact us, we will provide appropriate solutions within 24 hours THTEN CMZST260H Trimmer Head Replacement Spring and Cover Cap Compatible with Craftsman CMCST920 CMCST960 CMCST960E1 Type 1, CMCST920M1 Qucikwind Weedwacker Series String Trimmer