80/20 Inc., 3297, 15 Series, Drop-in T-Slot Stud 5/16-18 X 1.25" (5 Pack)Drop-In T-Slot Stud 5/16-18 x 1.25". Strongest fastener available for joining plates. Slide in from extrusion end. Square neck prevents screw from rotating in the t-slot.
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