GRADE 12.9 ALLOY STEEL: Made of grade 12.9 alloy steel, the surface is oxidized and has good extension strength and resistance in many environments.
HIDDEN HEAD: The head cover can be driven when there is not enough space to accommodate the wrench, and it can also be fixed without using the tool box.
APPLICATION: Socket head cap screws can be used as fasteners for home office equipment, communication equipment, ship assembly or other machinery industries to meet your various needs.
THREAD LENGTH: 4mm (20Pcs), 5mm (20Pcs), 6mm (20Pcs), 8mm (20Pcs), 10mm (20Pcs), 12mm (20Pcs), 16mm (20Pcs), 20mm (20Pcs), 25mm (20Pcs). The package includes about 180 screws and 100 nuts.
USE ON A FLAT SURFACE: Use it in a confined area below the surface where the head needs to be flattened to fix the target.