
Professional quality Cobalt Metal Drill Bit Set Hole Saw. Working length 1.5 cm. Shank 9.5 mm HSS drill bits for Cobalt Steel, high speed steel 5% cobalt, very resistant. Drill bits for steel, aluminum, metal, wood, plastic materials Set of 5 hole saws. Diameter: 16 mm, 18.5 mm, 20 mm, 25 mm, 30 mm Application: steel, aluminum, plastic, wood