80 Pcs Self Tapping Screws for Metal,M4.2x38mm Self Drilling Screws,Countersunk
£9.90
????【How to choose the size 】: Match screw length to material thickness,M4.2x38mm. It is necessary to assess the material properties beforehand. ????【Technical Specifications】: Surface Hardness: HV450-600 (Vickers Hardness).
