1Use high quality materials and fine grinding process makes bit more sharp cutting edge 2Drill bit has a large scraps discharge space, little resistance and smoothly during the scraps discharge 3Reduce cutting force and broken drill, improve the quality of hole wall 4Easy to change out and do a great job cutting through the PCB for solder holes 5Come in a great storage container that is easy to grab the drill bit you need when you need itDescription: _x000D_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, suitable for PCB, SMT, CNC, mold, sculpture, plastic, copper, stainless steel. _x000D__x000D__x000D_Features: _x000D_Use high quality materials and fine grinding process makes bit more sharp cutting edge. _x000D_Drill bit has a large scraps discharge space, little resistance and smoothly during the scraps discharge. _x000D_Reduce cutting force and broken drill, improve the quality of hole wall. _x000D_Easy to change out and do a great job cutting through the PCB for solder holes. _x000D_Come in a great storage container that is easy to grab the drill bit you need when you need it._x000D__x000D__x000D__x000D_Specifications: _x000D_Material: Tungsten Steel, White Steel_x000D_Ring Color: Random _x000D__x000D_Cutting Edge Diameter: 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.7mm, 1.2mm, 1.3mm, 1.4mm(Optional) _x000D_Shank Diameter: Approx 3.175mm _x000D_Length: 38.1mm / 1.5" _x000D_Box Size: 8.7 x 5.3cm / 3.42 x 2.08"_x000D__x000D_Quantity: 10pcs per set_x000D__x000D_Weight: 38g(approx.) _x000D__x000D__x000D_Package Includes: _x000D_1 Set(10pcs) x Drill Bits _x000D__x000D__x000D_Note:_x000D_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.