METRIC DIN 964 ISO 2010 BS 4183
SLOTTED RAISED COUNTERSUNK MACHINE SCREWS ARE MEASURED FROM THE EDGE OF THE HEAD NOT THE RAISED PART.
GRADE 4.8 STEEL ZINC PLATED.
GRADE A2 = 304 STAINLESS STEEL.
GRADE A4 = 316 STAINLESS STEEL.
ALSO AVAILABLE IN - BRASS, NYLON.