Craftsman Bolt-On 2-Speed Hammerdrill Attachment 9-34975 CMCMTHD Includes a double-ended bit tip, masonry bit, wood drill bit and twist bit. The drill combines torque and rapid impacts to get you through tough materials. The attachment easily changes between hammer drill and driver modes. The Hammerdrill can handle whatever you throw at it - masonry, wood, steel or plastic. Dual speed options include high speed for fast drilling or low for high torque.