TAC Force Spring Joker Knife; with Clip Black TF 457BS. The TAC Force Spring Assist Joker Knife; with Clip was created with an impressive stainless steel blade that will retain an edge for an insanely long time before requiring attention. For a great way to verify that you are cutting using one of the best cutting blades the knife community can give select the TAC Force Spring Assist Joker Knife; with Clip. Specifications for TAC Force Spring Assist Joker Knife; with Clip: Manufacturer: TAC Force Closed Length: 4.5 in Blade Material: Steel Handle Finish: Satin Additional Features: Clip Features of TAC Force Spring Assist Joker Knife; with Clip: 4.5 Closed Joker Knife Pocket Clip Package Contents: TAC Force Spring Assist Joker Knife; with Clip TAC Force TF 457BS: Spring Joker Knife; with Clip Black