Dowel Pin / Parallel Pin with Internal Thread DIN 7979 Standard sizes.Tolerance: m6 / M6, h7 / H7, etc.Hardness: HRC 58-62 with Gcr15. Material: Bearing Steel GCr15 / SAE52100, 100Cr6.Stainless steel 304 / A2, 316 / A4.Surface Finish: Plain, Plating, Black. Size, thickness, style or other specifications can be designed according to your drawings or samples.