Description K-T's direct replacement acetylene and fuel gas tips are designed specifically for use with original equipment manufacturer's apparatus. K-T cutting tips are made from high quality copper and brass bar stock instead of thin copper or brass tubing. All cutting tips are performance tested prior to shipment. K-T's design, workmanship and quality control assure the user of products that will perform better and last longer on the job. The following tips will fit Smith medium duty outfits. Cutting tips to fit SMITHÂ MC-12 Oxy-Acetylene Size 2