Our innovative thumb openers allow you to create your own style by adding the cabochon of your choice. Available for single or ambidextrous opening. Single openers are easy to install using one 3/32" allen wrench (HK106), one T5 Torx wrench (FX105)(Sold separately) and one cabochon. Ambidextrous openers assemble easily with two 3/32" allen wrenches (HK106 sold separately) and your choice of two cabochon (mix or match).Use our #RA600 Zero Flute Countersink to easily countersink the hole for a flat fit with the torx screw supplied. Glue the cabochon of your choice into the bezel.