Frank Beltrame 11" Swinguard Stiletto Automatic Knife 4mm Stag Teflon Bayo. New from italy, they have changed to 4mm from 3.5mm. From now on all knives will have 4mm blade and springs. If you have any 3.5" models they are now collectors items. Overall Length: 28cm - 11" Blade Length: 12cm - 5" Blade thickness: 4mm Teflon Bayo Blade material: AISI 420 Stainless steel Handle material: Stag Frame material: Stainless steel Made in: Italy.