This Delta table saw cast iron head assembly is designed for the 27″ fence and 1.38″ (35MM) rail. It is a replacement part for your table saw and is made in the United States. The head assembly is made of gray cast iron and is sturdy and durable. It does not include a battery and is not a power tool by itself. This item is perfect for those who need to replace the head assembly on their Delta table saw. It is a necessary part of the table saw fence and rail system and ensures that your saw functions properly. The head assembly is easy to install and is compatible with the Delta table saw model number 27-1.