Designed for drilling in cured concrete, brick, and block ,reinforced concrete, and other hard materials. Ensure free cutting and longer drilling life. Ensure free cutting and longer drilling life. Special sizes can be supplied as requirements. D HG-DT 32mm 0.275〞/7mm 100mm-450mm 42mm 0.275〞/7mm 52mm 0.275〞/7mm 62mm 0.275〞/7mm 68mm 0.275〞/7mm 72mm 0.275〞/7mm 82mm 0.275〞/7mm 92mm 0.275〞/7mm 102mm 0.275〞/7mm 112mm 0.275〞/7mm 127mm 0.275〞/7mm