Set of gradual drills by YATO YT-44731. Designed for drilling in high -quality stainless steel, structural and cold rolled steel, in colored metals, steel sheets, plastic. • Made of high -speed HSS 4241 steel, covered with nitride titanium that increases the life of drills • The edges of the drilled hole remain clean and without burrs • automatic centering on rounded and slippery surfaces • Fast heat dissipation when drilling in hard materials 3 drills with diameters 3-20 mm. • 3-12 mm drill, grades: 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 mm • drill 4-12 mm, grades: 4, 6, 8, 10, 12 mm Drill 4 -20 mm, grades: 4, 6, 8, 10, 12, 14, 16, 18, 20 mm