3M 28385, Square/Cross Pad Mandrel 28385, 1/4 in 3-48 external, 7010362491 
Insize 4701-1, ADJUSTABLE SQUARE, 6928640318351
$152.50
The straight edge can move and can be locked by the clamping screw.
Made of hardened stainless steel.
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Insize 4142-200, GRANITE SQUARE WITH V GROOVE, 7.9×7.9×7.9″, 6928640375538
$2,859.38
