WITH THESE BOTTOM PRESSPOTS YOU CAN GRAB ANY SQUARE SHAPED STONE SUCH AS PRINCESS-, ASHER-, RADIANT-, OR KUSHEN-CUT. THIS REFERENCE IS MADE OUT OF TOP QUALITY STEEL . POSSIBLE DEPTHS : 8% – 10% – 12% – 14% – 16% – 18% – 20% ( KINDLY ADD DESIRED DEPTH WITH THE REFERENCE WHEN ORDERING )