These are the OEM Toyota flywheel bolts for the 5SFE engine and crankshaft. They are a special design with a larger shoulder step that is about 12mm and then sizes down to 10mm threads where it screws into the crankshaft.

These are the bolts required to put a manual transmisison flywheel onto the 5S crankshaft like when building a stroker engine and running an aftermarket flywheel like ACT.