DeWalt's 40-Piece Screwdriver Bit Set is 28% off for Prime Day, taking the $28 bit kit down to just $20. This kit has earned an astounding 39,000-plus perfect ratings and has been purchased over 10,000 times just in the past month. It's also now sitting firmly in the No. 1 overall ranking among Amazon's bestselling screwdriver bit sets .

Note that this is a tool-only deal, so you’ll need a DeWalt 20-volt battery set to use it.