These plates are 100% equivalent to the following manufacturers:

• 80/20 #4480
• McMaster #3136N161

The dimensions are 4.5″ x 4.5″, and a thickness of .250″ (1/4″).  The holes are Ø0.328″, 1.5″ between centers.

• Made of 6105-T5 Aluminum and have a clear anodize finish
• They are compatible with 15 Series T-Slotted Extrusions