Steel, strip, sae 1095, spec ams 5121; austemper to knoop hardness of 426-466 per ams 2760; 0.244 in. Outside dia; 0.090 in. Long; 0.060 in. Wide is three places equally spaced; these three places protrude 0.020 in. Each out from the outside dia. Of the retainer; retainer lead for mine apers he m74