The stanley fat max 20m closed case long tape has a 95mm wide stainless steel blade that resists rusting and has metric only graduations its closed case design helps to protect the blade and internal workings and a non slip rubber grip the 3 to 1 gear ratio provides 3 times faster rewind and a steel roller cage protects the case from being cut by the blade during retraction there is also a corrosion resistant tru zero folding end hook for accurate measurements