Trademark ToolsT 18V Battery for 75-66007 [75-6618V] - Replacement battery for Trademark Stalwart 75-66007 78-Pc 18 Volt Cordless Drill Set Trademark Cordless Drill Set 75-66007 Battery top post length is 1.94" Please verify against your battery as fitment can be an issue Battery will not fit a Trademark or Stalwart 75-CD91 drill kit