Material: Alloy steel

The kit includes:
M3x10mm (30 pcs)
M4x12mm (30 pcs)
M5x14mm (40 pcs)
M6x14mm (50 pcs)
M8x18mm (50 pcs)
M10x20mm (40 pcs)
M12x25mm (20 pcs)

Features:
Suitable for fasteners of different sizes.
Widely used in shock absorption and insulation of mechanical equipment and industrial production.
Spring steel teeth resist vibrations that loosen traditional nuts.