Drilling into concrete or masonry can be tough work, especially if you do not have the correct tools for the job. Certain drills are better equipped with the required strength and power necessary to drill into these hard materials. The best drill to use on concrete is a hammer drill. Hammer drills have a built in hammer action that pulses the drill bit in and out while the drill is in motion. There are specialised drill bits available for drilling into concrete with a hammer drill. These drill bits are known as SDS drill bits.
Drill bits for concrete have a larger shank than other drill bits. There are four grooves in the shank of a concrete drill bit that is designed to fit into the chuck of the hammer drill. These grooves allow for the drill bit to move in and out and hammer into the concrete while drilling. There are special points at the end of the drill bits inserted into the chuck to prevent the bit from coming loose and displacing from the chuck.
Apart from this distinct feature, concrete drill bits have the same structure as other drill bits. They also have twisted grooves or flutes which are there to remove the debris the drill generates when drilling into concrete. Hammer drills tend not to remove the concrete debris from the drilling hole as effectively as other drills do. It is important to stop drilling from time to time and to remove the drill bit from the hole in order to dispose of the debris. When debris or powder builds up in the cement hole additional strain may be placed on the drill.
SDS Drill bits for concrete have another distinct characteristic which is evident on the tip of the drill bit. The tip is reinforced with various materials such as durium or tungsten carbide for extra durability and strength.