Set of 2 steel bolts for use in anchors on the ground or on a wall preferably of resistant materials such as concrete in garages or car parks to fix the bike, bicycle or other belongings. Includes 2 expandable dowels, 2 depth screws and 2 safety balls to prevent screws from being removed. Heavy Duty 16mm diameter bolts, M10 70mm length countersunk allen screws with flat head with standard inner hexagon for 6mm allen key (key not included). A 16mm drill bit (not included) is required for installation. Stainless steel dowels and anchor screws, high hardness, not deformed, not easy to rust, resist corrosion during long time use. Important: Before inserting the bolts into the hole, screw the screw until it touches the head with the dowel.