AWS-type DS block used for Shearwave Distance Sensitivity Calibration. It can be available in 3 different materials(Aluminium,Carbon Steel and Stainless Steel),AWS-type block used for longitudinal distance and sensitivity calibration. Contains a 2.0" high section between two 4.0" sections. In accordance with AWS requirements.. Dimensions: 6.000" x 4.000" x 2.000" (152.4 mm x 101.6 mm x 50.8 mm) AWS does not specify a separate metric version of the DS block. The metric block in AWS shows only the metric equivalents to the standard design. Therefore, this one block can be used for both inch and metric requirements.