Each Thread Sled is a mobile base allowing you to position the component within a 1/2" slot. It is retained by a cup washer, which permits custom positioning anywhere within the slot you have cut. Easy one-hand adjustment of the sled is a useful feature, providing repositioning of attached components by sliding the thread sled in the slot.
It has four 1/4"-20 UNC tapped holes on one-inch and two-inch centres which provide useful attachment points for brackets, footrests, braces, etc. Here is the thread sled used in an office chair we customized.
All parts have a black anodized finish.