Forgefix dog tooth washers are mainly used with carriage bolts where timber to timber connections are required the teeth bite in to the timber offering a no movement fastening the washers are zinc plated for increased corrosion resistance applicationused in many joints where restricted movement is required such as roofing joists newall posts on decking etc can be used with many types of bolts and fasteners in particular carriage bolts zinc coatings prevent oxidation of the protected metal to cre