These were on a 1600 JD I bought for the extra shanks and standards which were the same as the 1610's
Appear to be thicker than 1/2" but maybe not quite 3/4" thick.
2" straight point shovels.
If you need me to I can take one off and see if there is a name and part # stamped into them and also verify measurements and bolt hole dimensions.
extra thick chisel plow straight shanks
