Basic External Ring
Chart shows a selection of sizes available. For full specifications on the BASIC EXTERNAL RING, click the download button.
 Size No.     Ring Dimensions
d3 t b a d0
   STW -  3 2.7 0.25 0.5 1.7 0.7
   STW -  4 3.7 0.4 0.9 2.2 0.8
   STW -  5 4.7 0.6 0.9 2.4
   STW -  6 5.6 0.7 1.3 2.8 1
   STW -  7 6.5 0.8 1.4 3
   STW -  8 7.4 1.6
   STW -  9 8.4 1 1.8 3.2
   STW - 10 9.3 3 1.2
   STW - 11 10.2 2 3.1
   STW - 12 11.1 2.1 3.2 1.5
   STW - 13 12 3.3
   STW - 14 12.9 2.2 3.4 1.7
   STW - 15 13.8 3.5
   STW - 16 14.7 3.6
   STW - 17 15.7 3.7
   STW - 18 16.5 1.2 2.6 3.8
   STW - 19 17.5 2.7 2
   STW - 20 18.5 3.9