• Each concrete screw carbide drill bit is precisely ground to match a certain tolerance to assure proper hole diameter and to achieve maximum thread holding power.
• The flat on the shank fits all drill adapters. The drill bit is specially heat threated to make it very durable.
• Suitable for drilling holes in masonry, cement, ceramic tile, brick, block, rock, stone, concrete, metal, plastic, wood, etc.

Note:
1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.

2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.