Compound Decking Knife Cutting Compound for Decking Materials. For maximum performance and a high quality finish. Modified Triple tooth design. Tico Hi-Density Perma-Shield non-stick coating and specific to deliver more efficient and clean cuts with swirl marks from no less gumming teeth and longer lasting carbide.Features. Trex Blade. 1 in. Arbor. Dia - 12 in. Teeth - 84