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.