Description 5 different length screws in the same metric size. Head Type: Countersunk Socket Bolts Kit (flat, flush-fit design for a smooth surface). Drive Type: Hex socket (internal hex drive for secure tightening). Material: Choose between stainless steel G304 or G316 (unsure? Check the grade info tab for guidance). Thread Type: Fully Threaded in the most common thread, metric coarse (pitch diagram in photos). Grade Engraving Chart (X = No grade markings, ✓ = Has grade markings) M3 M4 M5 M6 M8 M10 M12 Stainless Steel (G304/G316) ✗ (✓/✗) ✓ ✓ ✓ ✓ ✓
