4-Blade (2 fixed and 2 mechanical) - Available in 100 - Chisel Tip - Stainless Steel Ferrule - .035 thickness blades - 1 Fixed Blade Cutting Diameter - 1 5/8 Expandable Cutting Diameter - 2 5/8 Total Cutting Diameter - Offset Fixed Blades to Induce Spin - 3 per pack - The Trocar HB and HBX both feature 0.035-inch-thick surgically sharp stainless steel mechanical blades that stay tucked in tight to the solid-steel ferrule in flight but they deploy reliably with a 1 5/8