"These swivel snap hooks have a trigger opening mechanism and can accommodate a ring that's about 4 mm thick.  The strap opening is 3/4\".  They have a shiny nickel finish.  Overall measurements are: 1-3/4\" long and 1\" wide at the strap loop end, 1/2\" wide at the trigger end. 18 pieces. This item is also available in a  2 piece pack: https://www.etsy.com/listing/230959034 6 piece pack: https://www.etsy.com/listing/230978237 36 piece pack: https://www.etsy.com/listing/253726960 Need more of th Hooks, Swivel Snap Hooks, Strap, Purses And Handbags, Bag Making, Hook, How To Make Handbags, Swivel, Etsy Shipping