Securities are allowed for Margin Pledge are updated real-time by our Risk Management team. We also take guidance from the NSE list in this regard. https://www1.nseindia.com/products/content/equities/equities/homepage_eq.htm
Please refer the below link of stock eligible for pledge - https://docs.google.com/spreadsheets/d/1HbTDJWzn9VT4ABqUgiE8M4-G-TP7UE08FIuPGWYj6dQ/edit#gid=0