Thread Size: M6 or 6mm; Screw Length: 20mm ( 8mm to 100mm available) | Allen Hex Drive Size: 4mm; Package: 30 PCS; | Thread Coverage: Full Machine Thread | IDEAL USE for baby bed, table, workbench, headboard, cabinet, cupboard, crib, cot and other furnitures. | Material: High Quality 18-8 Stainless Steel, great strength and good corrosion resistance to make fasteners last!