3M 28385, Square/Cross Pad Mandrel 28385, 1/4 in 3-48 external, 7010362491 
Insize 4794-025, 90? TOOL MAKER SQUARE, 1.0x.8″, 6928640317552
$48.52
DIN875 grade 00.
Beveled edge for inside measurement.
Made of hardened stainless steel.
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