uxcell M8 x 30mm Metric Hex Socket Countersunk Head Screw Bolts Black 20PCS Head Style: Countersunk; Material: 10.9 Alloy Steel; Package Content: 20 x Countersunk Bolts Product Name: Countersunk Bolt; Thread Size: (d x L1) M8 x 25mm/ 0.3" x 1"; Weight: 230g Drive Type: Hex Socket; Main Color: Black Thread Pitch: 1.25mm; Total Length: ( L ) 30mm/ 1.2" Head Size: (D x t) 16 x 5mm/0.6" x 0.2"(D*T); Width Across Flat (S): 5mm/ 0.2"