Blu-Mol Xtreme - 4 Specialised Drilling System Plus Quad- Set of 4 SDS Plus Fitting Hammer Bits are designed to work with a rotary hammer drilling machine. This is for hard concrete and industrial type construction work. The SDS Plus Hammer Bit has a quad head (4 cutters) for clean removal leaving a perfectly rounded hole. What's in the box: x 1 SDS Plus Concrete Hammer Bit - 5.0mm x 160mm x 1 SDS Plus Concrete Hammer Bit - 6.0mm x 160mm x 1 SDS Plus Concrete Hammer Bit - 8.0mm x 160mm x 1 SDS Plus Concrete Hammer Bit - 10.0mm x 160mm x 1 Plastic Strong Case Features: - Concrete, Stone, Masonry Application Specifications: - Weight: 0.25kg - Dimensions: 4 x 4 x 17cm - Warranty: Based on manufacturers default - Colour: Red - Material: Metal What's in the box x 1 Blu-Mol Xtreme - 4 Specialised Drilling System Plus Quad - Set of 4