uxcell M4x0.7mmx20mm 2.5mm Hex Socket Key Button Head Bolts Screws 50 Pcs Product Name : Button Head Screws;Material : 304 Stainless Steel;Color : Silver Tone Head Type : Button Head;Screw Type : M4x 20mm;Thread Diameter (d) : 4mm/ 0.16" Thread Length (L) : 20mm/ 0.8";Thread Pitch : 0.7mm;Hex Key Width (S) : 2.5mm/ 0.1" Head Size (dk xk) : 7 x 2mm/ 0.28" x 0.08" (D*H);Overall Size : 22 x 7mm/ 0.87" x 0.28"(L*D) Weight : 97g;Package Content : 50 (+/-2%) x Button Head Screws