Note If you need a 6-piece drill bit set as shown in the picture, Please select the specification: 6PCS Set With Box Strong compatibility FivePears Step Drill Bit And Drill Bit-Milling Cutter, Two In One 6Pcs/Set is suitable for lithium electric drill/hand electric drill/bench drill and other equipment. Note to users of lithium electric drills: 12V lithium electric drills have insufficient torque, so it is not recommended to use them. It is recommended to use 36V and 48V lithium electric drills. Step Drill Bit The surface of high-speed steel material is plated with titanium to make it have higher hardness and wear resistance. The drill bit adopts 118X type opening design, which can effectively prevent the drill bit from slipping. Double straight grooves make quick drilling and chip removal smooth. The universal triangular handle makes it suitable for all kinds of equipment and is more sturdy. Drill Bit-Milling Cutter, Two In One Use high-speed steel to plate titanium on the surface to make it have higher hardness and wear resistance. The drill adopts a 35 inclined blade design, and the cutting edge is sharp and wear-resistant. The special serrated cutting edge can be sawed horizontally after drilling. The universal round handle makes it suitable for various devices. Notice This product is not suitable for use with stainless steel metal