1pcs Thread Tap:Thread Size: 1/8-27 NPT; Thread Length: 18mm / 0.71"; Square Shank Size: 7mm / 0.28"; Total Length: 53mm / 2.09"; Accuracy: H21pcs Twist Drill Bit:Cutting Edge Diameter: 8.3mm / 21/64"; Shank Diameter: 8.3mm / 21/64"; Cutting Edge Length: 74mm / 2.91"; Total Length: 120mm / 4.72"Descriptions:6542 (M2) high speed steel tap and drill bit set offers excellent heat resistance and hardness for durability and longevity, and good cutting performance. Uncoated thread tap is great for a wide range of applications. Black oxide coating on drill bits improves durability, corrosion resistance and lubricity, and helps reduce friction and heat, extending tool life. Twist drill bit has sharp cutting edges and large spiral grooves, which provide neat and smooth cuts and facilitate the export of metal chips.