Slide-in T-nut is a fastening option that loads from the profile ends. It is a strong, durable connection. An essential for working with slotted aluminum extrusion, these t-nuts slide into the side-slot of aluminum extrusion profile. Works with 6mm, 10 series profile. They are inserted into the end of the extrusion and create a strong connection. Includes matching 1/4-20 x 1/2" stainless steel button head cap screws Combo Kit includes total of 100pcs. (50 Standard T-Nuts & 50 Stainless Steel screws)