4mm x 50mm Carbon Steel Hex Head Self Tapping Screws Black 50 Pcs Head Style: Hex Head; Material: Carbon Steel; Package Content: 50 (+/-2%) x Self Tapping Screws Product Name: Self Tapping Screw; Thread Size: 4mm x 50mm/0.16" x 2"(D*L); Weight: 186g Drive Type: Hex Socket; Main Color: Black Overall Size: 53mm/2.1"(length); Head Diameter: 6mm/0.24" Head Height: 4mm/0.16"; Hex Width: 3mm/0.12"