3M 91004, Drywall Sanding Sponge CP-042-4PK, Single Angle, 4-7/8 in x 2-7/8 in x 1 in, Fine, 7100111452, 4/pack 
3M 14308, AB14308, Square/Cross Pad Mandrel, 1/4 in 1/4-20 External, 7000045662 
Insize 4706-1200, 120? SQUARE, 7.9×7.9″, 6928640318283
$65.68
Made of hardened stainless steel.
7.9″ x 7.9″
120 Degree
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Insize 4142-200, GRANITE SQUARE WITH V GROOVE, 7.9×7.9×7.9″, 6928640375538
$2,859.38