Uxcell a15101300ux0181 Countersunk Bolt M6 x 25Mm Metric Hex Socket Countersunk Flat Head Screw Bolts 20Pcs Drive Type: hex socket; head style: flat head; material: 304 stainless steel Package Content: 20 x countersunk bolts; product Name: countersunk bolt; thread size: M6 x 21mm(d*l) Weight: 106G; main Color: Silver tone Thread Pitch: 1mm; total length: 25mm/1" Head size: 12 x 4mm/0.47" x 0.16"(D*t); Width across flat (s): 4mm/0.16"