Zero 655 5″ x 1/2″ Saddle ThresholdZERO thresholds feature top-quality materials and construction, designed to stand up to the demands of heavy traffic applications as well as those with extreme temperature differentials.The heavy-gauge material allows you to drill and screw our thresholds directly into concrete without the difficulties common when using lighter commercial materials, such as buckling under heavy loads or loose screws.Extruded from the 6063 alloy with hardness of T5 or T6Claw Grip EdgesANSI J32100, J321305W x 1/2HADA compliant and fire-ratedFeatures claw-grip edges