15 Series 1.5″ x 1.5″ SMOOTH Lite Tri-Slot T-Slotted Aluminum Extrusion.

SPECIFICATIONS:
Weight = 1.105 lbs/ft (1.563 kg/m)
Estimated Area = 0.878 in2 (5.663 cm2)
Moment of Inertia = Ix=0.181 in4 (7.533 cm4)
Iy=0.183 in4 (7.617 cm4)

These extrusions are 100% compatible with the following manufacturers:

• 80/20 #1503-LS
• T-SLOTS #650017
• FRAME-WORLD #EX-63
• McMaster #47065T541

Extrusions have a clear anodized finish, and may have one end anodized as well.
They are in the “15 Series”, and have a slot opening of approx. 5/16″.