Patented Phillips Square Driv Drive System * The Screw You"ve Used For Years Now Has A New Name! * ACR - Won"t Strip Out-Allows for More Torque * Lifetime Guarantee Will Not Rust * Can be used in Pressure Treated Lumber * Drives with a #2 square, #2 phillips and PSD2-2 * Free 1 inch PSD2-2 bit included * One-handed stick fit between screw and bit