Liong Mah Field Duty full size 3.75 inch bladeLIONG MAH DESIGN FIELD DUTY BEAD BLAST TITANIUM MARBLE CARBON FIBER 3. 75 FLAT GRIND BOHLER M390 The very capable Field Duty folder is designed to meet the challenges of outdoor use. The drop point blade is flat ground for great cutting performance. Paired with an opening hole cutout on the blade and reversible titanium spring clip for more versatility. The Field Duty comes with sculpted titanium handles or titanium bolster lock with Marble Carbon