S-B Power Tool Co., of Chicago, Ill., is recalling about 150 Skil model 6464 hammer drills. These drills are used for precision drilling into hard materials such as concrete and brick, as well as wood and metal. They have a black housing, and a red trigger and selector switch. These drills have a nameplate with "6464" on the side. The date codes 767 through 868 also are stamped on the nameplate, as well as the part number, "F012646400." Home improvement, hardware and industrial supply retailers sold these drills from April 1998 to August 1998 for about $139. They were sold in Florida, Illinois, Iowa, Missouri, New York and Texas.