4 Piece 10mm closed hook bolts

HEAVY DUTY: These heavy duty 8mm closed hook bolts have a zinc passivated finish for maximum protection. VERSATILE: They are ideal for secure and reliable fixing of items and fixtures concrete, stone and brickwork. 13mm SPANNER REQUIRED: A 16mm clearance hole is needed for the expansive bolt and the M16 thread requires a 10mm spanner to tighten the expansion nut.