Valley Oak wheel hoe attachments are built farm tough with tempered steel for strength and rust resistant powder coats. There are no tools needed to swap blades, simply remove the snap pin on the Quick Changer, pull off one assembly and replace with another, replace the pin and you're back to gardening. Each attachment carries a 2-year warranty. Valley Oak wheel hoe attachments are compatible with both the steel wheeled and pneumatic tire versions of the Valley Oak wheel hoe. Valley Oak attachments are not compatible with Glaser wheel hoes. *Warranty voided by abuse, such as running over the attachment with a truck or a tractor.