I have several sets of bits that do that for cabinet doors and I have specific slot cutting bits and matched sets, it's not for trimming.  


I found it on Amazon,  I remember buying it about 10 years ago to make some drawers.  It was worthless on pine.  

https://www.amazon.com/Yakamoz-Reversible-Locking-Woodworking-Diameter/dp/B081J177H7/ref=sr_1_24?crid=217OEZGH1ZIA3&dib=eyJ2IjoiMSJ9.C8EN8tOfrH_EpsQfmvTVSNiqrVgrymbl9sSNrDpruBE9J7rCijJFgEooMovSicc1vfa2UBICWjMD9e69NhHVV0m7y1RpJMBJps_lHzURxeg-l2a8GS8n2sCiVZecA9NKkCPXAoFDo52WZW68JEZg8dbAzCoRSDxYi5zdZsMU9rlUynDLi1roX_5fkWtYul-lvwEOWjqphNa1GJpFk1fJ94pORkMKufM6kO79qsbHE1pavUIx1HZSh1_6htnnFrDfPzmbq2pwZBQZkBUItHwNYrCisYmdKtSi_5rQFF_6FUE.c6PjtUgHQOJie_fQdjIbNAUjd--NJZdZqncYmXxz84w&dib_tag=se&keywords=locking+router+bit&qid=1758237492&sprefix=locking+router%2Caps%2C172&sr=8-24