M1,6 M2 M2,5~M20 Viti contropuntate con presa nera grado 10,9 bulloni a brugola esagonale

Head Style: Flat / Countersunk. Made from alloy steel, these screws are almost twice as strong as stainless steel pan head screws. They are angled under the head to sit flush in countersunk holes. The surface of the 10.9 grade socket head cap screws is cyanidated and blackened, and the product itself also has a certain anti-rust function.

eBay