M4 x 16mm Metric Hex Socket Countersunk Head Screw Bolts Black 50PCS Head Style: Countersunk; Material: 10.9 Alloy Steel; Package Content: 50(+/-2%) x Countersunk Bolts Product Name: Countersunk Bolt; Thread Size: (d x L1) M4 x 13mm/0.16" x 0.5"(D*L); Weight: 73g Drive Type: Hex Socket; Main Color: Black Thread Pitch: 0.7mm; Total Length: ( L ) 16mm/ 0.6" Head Size: (D x t) 8 x 3mm/0.3" x 0.12"(D*T); Width Across Flat (S): 2mm/ 0.08"