KDT1140 Features: -Standard 3/8" square drive.-Replacement bits available individually.-Serviceable product KDT1140 SAE impact driver set unfreezes rusted bolts and screws. Twist tool in direction of rotation and hold while striking with hammer to loosen screws and bolts. Reverse action to tighten bolts..-3/8in. Impact Driver Set With Impact Bits. Includes: -Four bits included with set: #2 Phillips, #3 Phillips, 5/16" slotted and 9/32" slotted .-Includes 3/8" square drive to 5/16" hex adapter for bits. Warranty: -Sets & Kits do not have warranty/ see individual pcs for details.