Abstract: One aspect of the present invention is a device for protecting a post during installation in the ground using an impact instrument. The device comprises a strike surface for receiving the instrument impact. The strike surface is disposed on a first side of the device. The device also comprises a seat for mounting on an upper portion of the post. The device generally covers the upper portion of the post when positioned thereon. Also, the seat is formed by at least one depression disposed on a second side of the device. At least part of the depression is shaped to receive the upper portion of the post inserted therein.