Free frozen bolts and screws by twisting the tool in the direction of the rotation and holding while striking with a hammer. Reverse action to tighten bolts. Set is standard 3/8" square drive and includes a 3/8" square drive adapter for 5/16" hex bits. Four-bit set includes a No. 2 and No. 3 Phillips and a 5/16" and 9/32" slotted. Set is a serviceable product and replacement bits are available individually. Replacement part: 412402 No. 2 Phillips Replacement part: 412403 No. 3 Phillips Replacement part: 412410 5/16" Slotted Replacement part: 412406 9/32" Slotted