Uses HSS-M2-Co material (much better than 4241, 6542 material), more durable, can be used in various applications. to drill steel plate, even 304 steel plate from 2 to 2 4 mm. The lifespan is 5 to 4 mm. 10 times longer than taps (life will be longer and performance will be better.) 118° X, you can drill at any angle, without slipping. DIY Supplies: Metalworking Size: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5. Product Description Description: Uses HSS-M2 material- Co (much better than material 4241, 6542), more durable, can be used to drill steel plate, even 304 steel plate from 2 to 2 4 mm. The lifespan is 5 to 4 mm. 10 times longer than a drill bit tap. (The service life will be longer and the performance will be better.) 118° X, you can drill at any angle, without slipping. Specification: Type: rotary drill bit tap Material: HSS-Co Shank: 1/4"(6.35mm) hex shank DIY Supplies: Metalworking Size: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5. Package included: 6pcs tapping drill