The 15900 Extension Protectors Basic Kit consists of two ½” square drive male and female hammers that connect to any length ½” drive extension, effectively protecting the extension ends should it be otherwise used as a hammer drift. The 15900 Extension Protectors expand the range of ordinary tools found in a technician’s box. The right tool for the right job makes all the difference, enabling a technician to work more efficiently and increase their profit earning potential.