These should have been 1/2" pins. They were .378" or about 10mm. I sent them back and a replacement came the next day, but they were also mislabeled. Don't trust this company. Gave them two Tried and failed every time
Pros
DIFFERENT SIZES: Pack of wooden dowels contains 200 pieces. - 1/4" x 1 1/4", 200 pcs - 5/16" x 1 1/4", 100 pcs - 3/8" x 1 1/2".