Bosch 2608590090 Masonry Drill Bit Set (Blue, 5-Pieces) Bosch 5 pieces masonry drill bit set. Specifications: Diameter 4mm, 5mm, 6mm, 8mm and 10mm. Inch Size: 5/32, 3/16, 15/64, 5/16, 3/8. Material: HSS with brazed carbide tip. Type: Double flute conical tip for drilling in masonry, concrete, brick wall. Used with impact or hammer drill machines. Fitted with keyed or keyless 3 way jaw chuck. Model Number: 2608.590.090. Total Length: 4mm. Drill: 75 mm, 5mm. Drill: 85 mm, 6mm. Drill: 100 mm, 8mm. Drill: 120 mm, 10mm. Drill: 120 mm.