Possible Clues:

• Carpenter's tool
• Carpenter's time-saving tool
• Carpenter's tool, or a carpenter, at times
• A carpenter, at times
• Carpenter's gadget
• Roofer's power tool
• Protects fingertip in hospital for one making stuff that will go under the hammer perhaps
• It's faster than a hammer
• Hammer's faster relative
• Carpenter's gun, perhaps