Stock Float refers to the total number of available shares to trade in the Open Market.
FataFat stock screener, has stock float Screening feature for the F&O stocks.
You can sort from high to low or low to high, or even filter stocks within your specific range.
Day traders, prefer to do intraday trades in low float stocks and avoid stocks with huge float.
The chances are that on a stock with low float even a small demand would create a higher impact on price.
FataFat Stock Screener helps you identify the Float quantity of each stock.
UPDATE: PLEASE NOTE THIS FEATURE IS NOT AVAILABLE ANYMORE ON THIS SCREENER, SINCE THIS DATA POINT IS LESS RELEVANT WHEN DAYTRADING F&O STOCKS.