These plates are 100% equivalent to the following manufacturers:

• 80/20 #4481
• T-SLOTS / Futura #658136
• McMaster #3136N158

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 most 15 Series or 8mm T-Slotted Extrusions