This versatile magnetic holders are from printables by orax.

He did a really good and detailed instruction on this so i keep it short.

These holders are mounted with skadis nut, see details here: https://www.printables.com/model/228663-t-nuts-for-ikea-skadis-pegboards

Needed hardware:

• 2× Printed M2.5 T-Nuts (link above)
• 2× M2.5 DIN934 Hex nuts
• 2× M2.5 × 16mm or M2.5 × 18mm screws
• Magnets
  • Tool holder variant: round 10x5mm per slot
  • screw driver holder: 2x round 5x5mm per slot

Screw driver holders:

• available with 2, 4, 6 and 8 slots
• dual color indicator version or blank version available
• for light thing like screw drivers

Tool holders:

• available with 1, 3, 5 and 7 slots
• dual color indicator version or blank version available
• for heavier tools