3M 86434, Scotch-Weld EPX Mixing Nozzle, Square Green, 1:1 and 2:1, 48.5mL and 50mL, 7100104991 
Insize 4701-1, ADJUSTABLE SQUARE, 6928640318351
$160.94
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
$2,894.53