[M12]

■Shape: Tapered washer
This is a square shape that fits between the bolt or nut and the base material, and is sloped on one side.
Also known as "tapered angle washer", the washer seat itself is slanted and used in places where tightening points such as groove steel and I-shape steel are angled to ensure correct tightening.

■Material: Iron
"Iron" is "steel" and is an alloy of iron containing carbon.
Although it is commonly used in many circulations, it is cheap materials, but due to the downside of it is easy to rust, many surface treatments will reduce corrosion.

■Surface treatment: Parka
As the general names of "black dye" and "parker rising", we use "black dye". It is oily and sticky, and it has a rust resistance that is more effective than fabric, and it does not rust easily.
Color is "Black".