While at McMaster be sure and check out their Precision Ground Blanks:
Part Number 9115K31 $20.22 Each
Material: Polycarbonate
Form: Precision Ground Blanks
Thickness: .5"
Thickness Tolerance: ±.005"
Length: 12"
Length Tolerance: ±.01"
Width: 2"
Width Tolerance: ±.01"
Operating Temperature Range: -40° to +240° F
They also offer them in thickness of: .25" .375" .5" .75" & 1"
Widths of: 2" 4" & 12"
All seem to be 12" Lengths, not a bad price if you ask me.
peace.
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