Name: 20pcs Imperial Numbered Diamond Hand Twist Blue Diamond Hand Twist Drill Bit, Clamping: 0.3-1mm, Weight: 25g 20PC Twist Drill Bit Specifications: #61(.0390") #62(.0380") #63(.0370") #64(.0.0360") #65(.0350") #66(.0330") #67(.0320") #68(.0.0310) #69(.0292") #70(.0280") #71(.0260")#72(.0250")#73(.0240")#74(.0225")#75(.0210") #76(.0200")#77(.0180")#78(.0160")#79(.0145")#80(.0135") Weight : 30 g