Description: These bits work fantastic on PCB boards. Sharp and twisted flute will make the drilling be more easy and effortless. They come in a easy-to-use plastic case with a holder for each bit. Drills bits are perfect for delicate drilling through hard materials for model engineering, jewelry repairs, craft work, s uitable for PCB, SMT, CNC, mold, sculpture, plastic, copper, stainless steel. Features: Use high quality materials and fine grinding process makes bit more sharp cutting edge. Drill bit has a large scraps discharge space, little resistance and smoothly during the scraps discharge. Reduce cutting force and broken drill, improve the quality of hole wall. Easy to change out and do a great job cutting through the PCB for solder holes. Come in a great storage container that is easy to grab the drill bit you need when you need it. Specifications: Mat erial: Tungsten Steel, White Steel Ring Color: Random Cutting Edge Diameter: 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.7mm, 1.2mm, 1.3mm, 1.4mm(Optional) Shank Diameter: Approx 3.175mm Length: 38.1mm / 1.5" Box Size: 8.7 x 5.3cm / 3.42 x 2.08" Quantity: 10pcs per set Weight: 38g(approx.) Package Includes: 1 Set(10pcs) x Drill Bits Note: Due to different batches, color of rings might be different from the ones in picture. Please take the real one as standard. Thanks for your understanding. .