INSTALLATION TIPS:
First, drill a hole 0.5mm larger than the diameter of the 5/16"(8mm) barrel nut;
Put the screws and nuts on both sides of the object, and then use the 4mm wrench to tighten the bolts and nuts.

Specifications:
Thread Size: M6
Screw Length: 20mm / 0.79"
Barrel Nut Length: 15mm / 0.59"
Barrel Nut Diameter: 8mm / 0.31"
Screw Head Diameter: 12.8mm / 0.5"
Hex Drive Size: 4mm / 0.16"
Material: Carbon Steel
Finish: Black Powder Coating

Package Content:
10pcs x M6x20mm Bolt
10pcs x M6x15mm Barrel Nut
1pcs x 4mm Allen wrench
SIZE - Applicable Hole Diameter: 5/16"(8mm); Screw Size(Male): M6x20mm(D*L); Barrel Nut Size(Female): M6x15mm(D*L); Screw Head Diameter: 12.8mm; Thread Pitch: 1mm.
MATERIAL - Made of carbon steel material, after black powder coating, the screws have high hardness and good toughness, are strong and durable for use.
PERFORMANCE - The male threaded bolts and female threaded barrel nuts both feature standard metric coarse threads. After installation, they will be tightly connected and firmly bind the objects. Hex drive rounded head bolts ensure stability and are not easy to loosen.
APPLICATION - Widely used in DIY projects, leather crafts and furniture installation. Can be used for albums, scrapbooks, belt buckles, leather bags, etc. They are ideal replacement parts for your bed frames, tables, chairs, cabinets, workbench, wood boards, wardrobes and so on.
WHAT YOU GET - This kit includes 10pcs x hex drive binding screws, 10pcs x barrel nuts, and 1pcs x 4mm allen wrench. We provide various sizes for you to choose from. If you have any questions, please feel free to contact us!