10-100 pcs Plastic Oval Cylinder Cord Locks 1/4 Inch 100 pieces per pack. Free shipping. Work with elastic cord, nylon cord, paracord. Made of Polyoxymethylene (POM), also known as acetal, polyacetal, and polyformaldehyde, is an engineering thermoplastic used in precision parts that require high stiffness, low friction and excellent dimensional stability. Springs Made of Iron, Nickel-Free Plating One Hole, Hole Size mm 6 x 8, Height 29 mm, Wide 16 mm, Thickness 11 mm Item number: P048 Black