Features: 100% brand new and high quality. Made of HSS durable and quality assurance long term use. Ideal for auto repair and machinery where metric threads are specified. 5pcs contains M3 M4 for 5 M6 M8 machine screw thread metric plug taps. Item type: machine screw thread metric plug tap Material: HSS Color: silver tone Size: 3mm 4mm 5mm 6mm 8mm Thread Diameter :3mm(M3) 4mm(M4) 5mm(for 5) 6mm(M6) 8mm(M8) Length: 46mm/1.81” 49mm/1.93” 55mm/2.17” 59mm/2.32” 59mm/2.32” Package includes: 5 x machine screw thread metric plug taps