The Crescent 4 Piece Square Dual Material Screwdriver Set, part CSQSET4PC. It has 4 pieces. Supplier specification: SCRDR SQUARE SET DM 4PC.
The size of the tip matters as much as its type. A driver that is too small cams out and rounds the recess, and a rounded recess is far harder to remove than a tight fastener. Match the tip to the screw and press in line with the shaft.
