This 5-piece hand tap drill set is made of durable bearing steel and is suitable for auto repair and machinery where metric threads are needed. The set includes sizes M3-M8 with cutting drill bits and professional quality straight flutes for quick and efficient threading. Ideal for both machine and hand use. Features: - Cutting drill bits, professional set. - Ideal for auto repair and machinery where metric threads are specified. Specifications: Material: Bearing steel Sizes: M3 M4 M5 M6 M8 Thread Diameter: 3mm(M3) / 4mm(M4) / 5mm(M5) / 6mm(M6) / 8mm(M8) Package included: 5 x Hand Tap Drills Notes: 1. Manual measuring, please allow 1 ~ 3mm error,thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.