... Grinding Angle:118-140 Degree PP-20 Drill Bit Sharpener Features:Economical Price, Easy to Use, and Simple in ... slot twist drill, material of drill as quick cutting steel, tinning drill, cobalt-plated drill, parabola drill, drill with taper shank, hard alloy drill.The length of drill shank is ... with one 3mm drill within 15 seconds, and with one 19mm drill within 60 seconds. PP-20 Drill Bit Grinder(3mm ...