A monolithic LED chip is disclosed comprising a plurality of junctions or sub-LEDs mounted on a submount. The template includes at least one contact surface for engaging a surface of the patella. The lighting member shines light to the gem stone which then refracts or reflects light from various angles to produce dazzling light. This apparatus makes it possible to size the inner diameter of a pipe end with superior dimensional precision22\u2266LR\u2266115 \u2003\u2003R2\u2267R1 \u2003\u2003. In this configuration, an effective recording area has an effective recording width that is equal to or more than the track width, and equal to or less than a sum of the track width and a doubled value of width of concave portions between the tracks. The locking device is in the form of wedges to open and close the passage for the thread.