This Drill Bit Set contains 16 pieces of bits of various sizes to meet different drilling needs. Are perfect for use with electric core drills for drilling on granite, hard stone, concrete, reinforced concrete, and other hard surfaces. The construction will ensure smooth operation of the drills. Diameters: Ø 26 mm, Ø 32 mm, Ø 44 mm, Ø 50 mm, Ø 63 mm, Ø 71 mm, Ø 82 mm, Ø 102 mm, Ø 110 mm, Ø 120 mm, Ø 132 mm, Ø 150 mm, Ø 180 mm, Ø 202 mm, Ø 220 mm und Ø 244 mm. Segement Height: 7 mm. Length of each bit: 400 mm. Threaded connection: 1 1/4.