• Ideal for hanging punching bags on concrete ceilings. • Guaranteed safety with high-quality 304 stainless steel. • Simple and professional design for attaching to wood, metal, cement, or plaster. • Versatile use: fastening yachts, boats, decorative ropes, nets, resistance bands, etc. • Package includes 4 stainless steel plates, 16 screws, and 16 wall plugs. • Eye plate size: 4 cm x 3.5 cm x 3.5 mm. • Thickness: 3.5 mm. • Screw hole diameter: 5 mm.