Cross grooved. Extra wide faces are cross grooved and used for shrinkage on large surfaces ? chisel end used on sharp corners. Only Martin Provides This Added Warranty -- If a Hammer Head Should Loosen at Any Time, Return It for Handle Replacement or a New Hammer. Made in USA
![Shrinking Hammer with Wood Handle, Martin Sprocket #162G Shrinking Hammer with Wood Handle, Martin Sprocket #162G](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/7387/307280/162G__55003.1411586338.1280.1280__56158.1588962608.jpg?c=2)