ITEM NAME:20 PCS M6 x 16mm Hex Socket Button Head Screws Black S5A1 20 PCS M6 x 16mm Hex Socket Button Head Screws Black S5A1 Drive Type: Hex Socket Head Style: Button Head Product Name: Socket Button Head Screws Thread Size: 6(M6) x 16mm/ 0.24 x 0.6 inch (D*L) Weight: 79g 10.9 Tensile Strength . Alloy Steel material . Socket Button Head . Fastener Type: Machine Screw . Total Length: 19mm/ 0.7 inch Tensile Strength: 10.9 Head Diameter: 10mm/ 0.4 inch Hex Key Size: 4mm/ 0.16 inch Color: Black Material: Alloy Steel Package Content: 20 x Socket Button Head Screws Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Drive Type: Hex Socket. Fastener Type: Machine Screw. 10.9 Tensile Strength. Alloy Steel material. Socket Button Head. Head Style: Button Head.