Bosch Universal Oscillating Multi-Tool Adapter OIS001 - The Home Depot
From Starlock® to OIS / OIS12 Multitool Adapter (screw)
Ocillating Multi Tools Shank Adapter For All Kinds Of Multimaster Power Tools Ois Starlock Oscillating Saw Blades Adapter - Power Tool Accessories - AliExpress
Starlock adapter - makes your universal / OIS12 blades compatible with machines from Bosch and Fein - YouTube
Starlock Multitool Adapter™ (Screw-System) - Oslo Tool Company Int.