This Snapmatic module by Systematic Tools was originally designed to hold only the Knipex 125mm Cobra pliers but I realized the super strong connector magnets would let me magnetically hold smaller pliers and even tools like a box cutter and flashlight so this is now a pretty universal holder that will hold a lot of different small tools.  The modules use powerful rare earth magnets to connect them together with a snap.

The module is designed to hold these tools:

• Knipex Cobras, 125mm 
• Knipex Pliers Wrench, 125mm
• Knipex Cobras, 100mm 
• Knipex Pliers Wrench, 100mm
• Workpro 4" water pump pliers 
• Workpro 4" pliers wrench 
• Workpro 4" slip joint pliers 
• Workpro 4" needle nose pliers 
• Klarus E5 flashlight 
• Workpro utility knife 
• Gerber EAB utility knife 
• Klein electrician scissors
• Knipex diagonal cutters, 125mm
• Knipex combination pliers, 110mm

Instructions for connector magnet and strike plate

• Source parts:
  • (1x) 60x10x3mm N52 magnet for side connector from JC Magnetics
  • (1x) 60x14x1mm strike plates from TotalElement
• Use 60-80 grit sandpaper to rough up surface deeply for glued sides (4-6 passes in two directions)
• Wipe surfaces with Acetone to clean
• Apply even surface of gel-style CA glue to pockets
• Place magnet or strike plate into pocket, clamp for 5 minutes
• Release clamp and allow it to cure for 24 hours before using

If friction fit it loose on rachet or extender, apply a tiny bit of blue tack to add friction. A little goes a long way.

Want more info? Visit the Systematic Tools website (sorry can't link here)