20 Metal Chrome Skull Bead Combo Pack For 550 Paracord Bracelets, Lanyards, & Other Projects (5 Each) 20 Brand New Chrome Alloy Skull Combo Pack For Paracord Projects Ugly Skull Measurement: 12mm x 11mm with an approximate hole size of 5mm. Ninja Hooded Skull Measurement: 15mm X 11mm with an approximate hole size of 5.5mm. Chrome Skull Measurement: 20mm X 11mm with an approximate hole size of 6mm. Fang Skull Measurement: 18mm X 12mm with an approximate hole size of 5mm.