Product Specification: ​ ​Material:Tungsten Carbide ​ ​Shank Type: SDS plus ​ ​Length: approx. 160mm(6-5/16'') ​ ​Size:5mm,5.5mm,6mm,6.5mm,7mm,8mm,10mm,12mm,14mm,16mm. ​ ​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 ​uitable for clinker, concrete, brick, natural or artificial stone ​ ​Note: ​ ​Please allow minor difference due to manual measurement.