US STOCK, You will receive the package within 5 workdays !!! Description: High Speed Steel: High hardness, good wear resistance and durability. High Quality: suitable for drilling holes in alloy steel, wood, nonferrous metal, cast iron and hard plastics. Surface Titanium Coated: Increase the HARDNESS of the drill bit, Strengthen heat dissipation, make bit more WEAR-RESISTING Application: Ideal For DIY, Home And General Building/Engineering Using 50pcs & 5 Sizes: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, there are 10pcs of each size, total quantity is 50pcs Product features: Please note: This drill bit set can NOT be used in the impact drill. 5 Sizes: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, there are 10pcs of each size, total quantity is 50pcs. Mainly for thinner, low hardness of wood and soft metal hole processing, for high hardness stainless steel and other materials can not be processed. The main material is high-speed steel, with titanium and nitriding treatment.High speed steel is more abrasion resistant and durable than other metal materials. 1mm and 1.5mm bits should be used with pin vise, avoid drill bit break, 2mm to 3mm bits can be used with power drill, only with low speed and low drilling pressure. Instructions: Use with pin vise or low speed power drill (NOT FOR impact drill). Ideal For DIY, Home And General Building/Engineering Using; Hss Drill Bit Set For Wood, Plastic And Aluminum. Measurement: # 1.0mm: length 33.5mm # 1.5mm: length 40.3mm # 2.0mm: length 48.5mm # 2.5mm: length 55mm. How to Use Twist Drill Bits: -Ensure the left and right cutting edges of the drill are symmetrical when drilling. -Observe the uniformity of the spark while drilling, adjust the pressure in time, and pay attention to the cooling of the bit. Package Included: 10 x 1.0mm Drill Bit; 10 x 1.5mm Drill Bit; 10 x 2.0mm Drill Bit; 10 x 2.5mm Drill Bit; 10 x 3.0mm Drill Bit. Total Quantity: 50pcs