Detail 8Pcs SDS Plus Hammer Drill Parts Set 40Cr Steel Stone Drill Bit Cross Cutter Concrete Drill Bit 5-18Mm Drill Saw Bit SetThis product mainly uses 45#/40Cr steel, YG8C cutting head is made of hard alloy welding. Based on high-quality raw materials, the hardness is greatly improved by high-temperature quenching, which is longer than medium carbon medium carbon steel drill bits. Copper cross head surface, self-centering cutter tip, high-speed drilling, fast chip evacuation; Four-slot design, fast chip evacuation, reduce wear. Used with electric hammer, used for drilling glue, concrete, brick wall and other stone materials, widely used in construction, installation and other industries, it is a highly efficient professional drilling machine. Surface treatment: sandblastingCutter head: cross copper platingOperation mode: deep drillingDiameter:8pcs: 5, 6, 8, 10, 12, 14, 16, 18mm Length: about 160MMColor: silver-gray Material: steelPackage content:8*hammer drillOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.