Blu-Mol Xtreme - 8 x 160 Specialised Drilling System Plus Quad Set - Set of 10 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 10 SDS Plus Concrete Hammer Bit - 8.0mm x 160mm x 1 Plastic Case Features: - Concrete, Stone, Masonry Application Specifications: - Weight: 0.55kg - Dimensions: 8 x 9 x 1cm - Warranty: Based on manufacturers default - Colour: Red - Material: Metal What's in the box x 1 Blu-Mol Xtreme - 8 x 160 Specialised Drilling System - Set of 10