Self-aligning roll-in T-nut with ball spring is a fastening option that loads either from the profile ends or side, which is helpful for applications where the ends are inaccessible. The projection on the T-nut aligns it in the T-slot while the ball spring holds the fastener in place, even when the profile is in a vertical position. Compatible with 15 & 40 Series profiles with 8mm slot. Steel with Bright Zinc finish, discount applied to bulk packages of 96 and larger.