Screw hook size:
- Ceiling hook 1/2 inch: total length is approx. 20 mm/ 0.79 inch, screw thread length is approx. 7.3 mm/ 0.29 inch
- Ceiling hook 5/8 inch: total length is approx. 26 mm/ 1 inch, screw thread length is approx. 10 mm/ 0.39 inch
- Ceiling hook 3/4 inch: total length is approx. 30 mm/ 1.18 inch, screw thread length is approx. 11 mm/ 0.43 inch
- Ceiling hook 7/8 inch: total length is approx. 32 mm/ 1.26 inch, screw thread length is approx. 9.7 mm/ 0.38 inch
- Ceiling hook 1 inch: total length is approx. 37 mm/ 1.46 inch, screw thread length is approx. 11.6 mm/ 0.46 inch
- Ceiling hook 1-1/4 inch: total length is approx. 45 mm/ 1.77 inch, screw thread length is approx. 13.2 mm/ 0.52 inch

Package includes:
20pcs x 1/2 inch cup hooks
15pcs x 5/8 inch cup hooks
15pcs x 3/4 inch cup hooks
9pcs x 7/8 inch cup hooks
8pcs x 1 inch cup hooks
8pcs x 1-1/4 inch cup hooks