Features The drill bit has a large waste discharge space, little strength and smoothly during waste unloading. Use high quality materials and fine grinding process makes it a little sharper. Reduce the cutting force and broken drill, improve the quality of the hole wall. Come in a large storage container that is easy to grab the drill you need when you need it. Easy to change and does a great job of cutting through PCBs for solder holes. Description: These bits work beautifully on PCB boards. Twisted flute will make drilling easier and effortless. They come in an easy to use plastic case with a holder for each bit. The drill bits are perfect for delicate drilling through hard materials for model engineering, jewelry repairs, craft work, suitable for PCB, SMT, CNC, mold, sculpture, plastic, copper, stainless steel. Features: Material: Cemented carbide, HHS 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: about 3.175mm In Length: 38.1mm/1.5" Box size: 8.7 x 5.3 cm/3.42 x 2.08 inches Quantity:10pcs per pack Weight: 38g (approx.) Package includes: 1 set (10 pieces) x drill bits SMALL TIP: Due to different batches, the color of the rings may be different from the picture. Please take the real one as standard. Thank you for your understanding. Package List