I needed a simple design to organizer my holster collection and keep them handy to switch out when needed.  Since I use a metal based wall organizer system it allows me to quickly keep the holster near the specific model.  Would also work well on the side of a metal wall storage cabinet.  Holder as designed requires two 20mmX4mm magnetics.  I used these https://www.amazon.com/dp/B0BZP85P15?ref=ppx_yo2ov_dt_b_product_details&th=1 which mounted quickly with the included adhesive disks versus having to glue them in place.