What are the specialties of the tarpaulin buckle on the car tarpaulin The tarp buckle on the car tarp is used to tie the rope, and then pull the tarp apart, located on the edge of the tarp. The tarp buckle seems to be a small part, but it exerts a lot of effects, and its production is very particular, let's explain it below.1. The tarpaulin buckle is best made of stainless steel.