Insize Metric Thread Ring Gage M24 × 2 mm Class 6g NOGO Ring Gage Series 4129 24TN 28 x 25mm D.O.C HSS 3 4" Universal Shank Annular Cutter The Insize 25–50 mm IP65 ER25 NT40 Precision 6 pc Collet Set The Insize 25–50 mm IP65 Outside Micrometer is a precision digital measuring instrument designed for accurate external measurements in demanding workshop and inspection environments ideal for use in harsh environments where protection from dust The Insize 4129 24TN is a high accuracy metric thread ring gage for checking external threads ensuring precise rejection of non conforming threads in production environments