Building your Trans form scratch?

Sold in Sets of 4
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1/8"
For #6 or 3mm Screws
OD = 0.25" (1/4") 6.35mm
ID = 0.141" 3.58mm
L = 0.125" (1/8") 3.175mm
Wall Thickness = 0.05" 1.38mm

5/32"
For #6 or 3mm Screws
OD = 0.25" (1/4") 6.35mm
ID = 0.141" 3.58mm
L = 0.156" (5/32") 3.962mm
Wall Thickness = 0.05" 1.38mm

6MM
For 3mm Screws
OD = 0.25" (1/4") 6.35mm
ID = 0.122" 3.1mm
L = 0.236" 6mm
Wall Thickness = 0.06" 1.62mm

1/4"
For #6 or 3mm Screws
OD = 0.25" (1/4") 6.35mm
ID = 0.141" 3.58mm
L = 0.25" (1/4") 6.35mm
Wall Thickness = 0.05" 1.38mm

7.4MM
For 3mm Screws
OD = 0.25" (1/4") 6.35mm
ID = 0.122" 3.1mm
L = 0.291" 7.4mm
Wall Thickness = 0.06" 1.62mm

21/64"
For #6 or 3mm Screws
OD = 0.25" (1/4") 6.35mm
ID = 0.141" 3.58mm
L = 0.328" (21/64") 8.331mm
Wall Thickness = 0.05" 1.38mm

3/8"
For #6 or 3mm Screws
OD = 0.25" (1/4") 6.35mm
ID = 0.141" 3.58mm
L = 0.375" (3/8") 9.525mm
Wall Thickness = 0.05" 1.38mm

1/2"
For #6 or 3mm Screws
OD = 0.25" (1/4") 6.35mm
ID = 0.141" 3.58mm
L = 0.5" (1/2") 12.7mm
Wall Thickness = 0.05" 1.38mm

9/16"
For #6 or 3mm Screws
OD = 0.25" (1/4") 6.35mm
ID = 0.141" 3.58mm
L = 0.563" (9/16") 14.288mm
Wall Thickness = 0.05" 1.38mm

3/4"
For #6 or 3mm Screws
OD = 0.25" (1/4") 6.35mm
ID = 0.141" 3.58mm
L = 0.75" (3/4") 19.05mm
Wall Thickness = 0.05" 1.38mm

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.100
For #12 or 5mm Screws
OD = 0.375" (3/8") 9.53mm
ID = 0.219" 5.56mm
L = 0.100" (1/8") 2.54mm
Wall Thickness = 0.07" 1.98mm