These Alligator anchors with flange nylon expand within a solid surface to help with distributing weight

10 x 3 1/2 Phillips Bugle Fine Drywall Screws Phosphate Coated - Carton (1000)

3/4-10 x 8 A307 Grade A Carriage Bolt HDG

They can carry twice the weight of a standard wing anchor but only require a ½ inch hole

5/8-18 x 4 3/4 Grade 8 Hex Cap Screw Yellow Zinc Plated

M36-4.00 x 110 Socket Cap Screw 12.9 Alloy Plain DIN 912 1/2-20 Grade 8 Hex Cap Screws Yellow Zinc Plated These Alligator anchors with flangeM36 4. 00 x 110 Socket Cap Screw 12. 9 Alloy Plain DIN 912 . Alloy Socket Head Cap Screws from Brighton Best. Hardness of RC 38 43, meets or exceeds DIN 912. Manufactured from heat treated alloy steel, 1960 series.