Product Specification: ​ ​Material:Tungsten Carbide ​ ​Shank Type: SDS plus ​ ​Length: approx. 160mm ​ ​9PCS:5mm,5mm,6mm,6mm,8mm,10mm,12mm,14mm,16mm. ​ ​Drill Diameter: 6mm(0.24"), 8mm(0.31"), 10mm(0.39"), 12mm(0.47"), 14mm(0.55"), 16mm(0.63") ​ ​Carbide tipped cross head drill bits, features precision cutting tips for quick, smooth cut and finish ​ ​Twin spiral, drilling efficiency, high precision ​ ​Long lasting life and features 4 cutting edges for hard masonry materials ​ ​Double pit double slot and round shank for efficient waste removal ​ ​Use by electric drills and drilling machines s​uitable for clinker, concrete, brick, natural or artificial stone ​ ​Note: ​ ​Please allow minor difference due to manual measurement.