THE NYLON T-NUT IS A LIGHT-DUTY FASTENING METHOD TYPICALLY USED FOR ACCESSORIES. THE T-NUT REMAINS IN PLACE EVEN WHEN USED IN A VERTICAL POSITION. WHEN USED WITH A SHEET METAL SCREW, THE T-NUT EXPANDS INTO THE T-SLOT. THERE ARE OPTIONS AVAILABLE WITH OR WITHOUT THE SCREWS. ADDITIONAL INFORMATION: PLEASE NOTE THAT NYLON SLIDE-IN T-NUTS 3346 AND 40-3346 ARE SOLD IN PACKS OF 50 AND 3348 AND 40-3348 ARE SOLD IN PACKS OF 12.,