US PRO SDS Plus Drill Bit Set - 5PC

These drill bits are manufactured from high-quality 40CR steel with a heat-treated tungsten carbide tip.

They are designed specifically for hammer drills with SDS Plus compatible chucks.

This set is intended for use on brick, concrete, mortar, and stone.

The set includes: 5.5mm x 110mm, 7.0mm x 110mm, 6.0mm x 160mm, 7.0mm x 160mm, and 8.0mm x 160mm.

Clean the bits after each use, store them in a dry place, avoid overheating by not forcing the drill, and inspect them regularly for wear.

The 110mm bits have a working length of approximately 50mm, and the 160mm bits have a working length of approximately 100mm.

While you might be able to rotate them in a standard drill, they are designed for the impact and rotation of a hammer drill with an SDS Plus chuck to be effective on masonry. They will not perform well or fit in a standard chuck.

Ensure the chuck is clean and free of debris. Retract the chuck sleeve, insert the bit fully until it clicks, and then release the sleeve. Make sure you are using an SDS Plus bit and not a different type.

Confirm that the hammer function on your drill is engaged. Ensure you are using the correct bit size for the anchor or fastener. Clean the bit and check for any buildup of debris that might be hindering performance. Avoid excessive pressure; let the hammer action work.

Reduce drilling pressure and avoid forcing the bit. Ensure the drill is not overheating. Check for hardened inclusions within the masonry material that may be causing excessive stress on the tip. Replace the bit if the tip is significantly damaged.

Use a center punch to create a small starting indentation on the material. Alternatively, try to keep the 135° point firmly on the marked spot and apply light pressure initially until a small divot is formed.