#1 and the lower item in #8 look like collet closers or adapters. The upper item in #8 might be a thread protector. If it will screw onto the right end of the spindle, that's probably what it is. The long tube (no number) right-center of the photo with the lever attached is a lever-type collet closer. Worth about half of what you paid for the whole lot. It inserts into the spindle from the left end and screws onto the left end of the spindle. A collet closer or adapter would be inserted firmly into the spindle taper (after screwing on the thread protector). A collet would be inserted into the closer with the longitudinal slot in the collet aligned with the short pin inside the closer. You twist something on the left end of the attachment to screw the tube onto the collet. When properly adjusted (tube screwed onto collet the proper amount, you slide a workpiece into the collet and move the lever to draw the collet closed on the workpiece. Moving the lever in the other direction releases the collet from the workpiece.
#5 is a single diameter (they are also made to cover a range of diameters) Pin Spanner. Used to turn, tighten or loosen something round with a hole in its OD for the pin.