Benchmark Balisong Trainer Folding Knife4in Black Die Cast Metal Handle 117 TRAINER. 4" stainless trainer blade drilled hole design. Black die cast metal handles with slot and/or hole cutouts. Specifications for Benchmark Balisong Trainer Folding Knife: Manufacturer: Benchmark Blade Length: 4 in Blade Grind: Dull (Training Knife) Handle Material: Die Cast Metal Blade Material: Steel Handle Color: Black Closed Length: 5 in Handle Finish: Black Knife Application: Folding Blade Package Contents: Benchmark Balisong Trainer Folding Knife Benchmark 117 TRAINER: Balisong Trainer Folding Knife4inBlack Die Cast Metal Handle