The Trocar HB and HBX both feature 0.35-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" expandable cutting diameter. The fixed blades are also 0.35-inch thick and have a cutting diameter of 1". They have an offset for increased accuracy and stability. The total cutting diameter of the HB and HBX is 2 5/8". The Trocar HB and HBX feature a bone-crushing chisel tip. 4-Blade (2 fixed and 2 mechanical) Available in 100 or 125 gr 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 Replacement Blades (SKU: 390)