uxcell 0.5mm Pitch M3x20mm Button Head Hex Socket Bolts Screws 100 Pcs Product Name : Button Head Screws;Material : 304 Stainless Steel;Color : Silver Tone Head Type : Button Head;Screw Type : M3x 20mm;Thread Diameter (d) : 3mm/ 1/8" Thread Length (L) : 20mm/ 13/16";Thread Pitch : 0.5mm;Hex Key Width (S) : 2mm/ 0.08" Head Size (dk xk) : 5.4 x 1.7mm/ 0.21" x 0.07" (D*H);Overall Size : 21 x 5.4mm/ 0.8" x 0.21"(L*D) Weight : 104g;Package Content : 100 (+/-2%) x Button Head Screws