The SDS plus drill chisel set is made of cemented carbide. After heat treatment and anti-rust treatment, it is hard and durable, and can be used for a long time The handle of the SDS-Plus chisel set has four grooves, and the smaller grooves keep the drill bit in the mandrel. Large grooves allow the drill bit to slide in the chuck during operation, increasing drilling torque and hammering energy without slipping The Portable Hammer Portable Concrete Drill Bit Tray can easily produce more of impact force, so as to achieve efficient and precise drilling The size of the rotary hammer drill bit set is 26x4x2cm/10.24x1.57x0.79inch, which is easy to store and use without taking up too much space The carbide tipped masonry tray is mainly suitable for excavation, wall building and operation of cement wall gravel, concrete, different stones, brick wall and other materials