Experience precision and quality with the GWS 500 Series Carbide Reamer, a must-have for any automotive enthusiast or professional. With a range of .3901 to .4000, these reamers are engineered to deliver smooth, efficient, and reliable performance for all your threading needs. Ideal for a variety of applications, the GWS 500 Series offers unmatched durability and accuracy, ensuring your work is always up to professional standards. Whether you're maintaining your car or engaging in a DIY project, these carbide reamers are the perfect tool for the job.