2pcs Spiral Point Tap:Thread size: M2.5 x 0.45 (right hand); thread length: 10mm / 0.39″; square shank size: 2.5mm / 0.1″; total length: 45mm / 1.77″2pcs Drill Bit:Drill size: 2.1mm (right hand); cutting edge length: 26mm / 1.02″; shank diameter: 2.1mm / 0.08″; total length: 50mm / 1.97″Descriptions:Thread tap adopts spiral point and straight flute design, with clear threads and no burrs. Screw tap provides downward chip removal, fast and precise tapping, suitable for through-hole threads. Machine tap is used in drill presses, tapping, CNC and milling machines. Not recommended for hand use and electric drill tapping.Twist drill bit adopts a spiral flute chip space design to remove chips quickly and cleanly. Cutting edges provide neat and smooth cuts. Use an appropriate lubricant to reduce friction and heat build-up.