Benchmade 591BK Boost AXIS-Assist Knife Black/Red (3.43" Black)

Item #BHQ-97057
MSRP: $190.00
Our Price: $139.99
Try Benchmade (Assisted) instead


  • Overall Length: 8.26"
  • Blade Length: 3.43"
  • Blade Thickness: 0.12"
  • Blade Material: CPM 3V
  • Hardness: 58-60 RC
  • Blade Style: Drop Point
  • Blade Grind: Flat
  • Finish: Black
  • Edge Type: Plain
  • Handle Length: 4.83"
  • Handle Thickness: 0.70"
  • Handle Material: Polymer
  • Color: Black, Red
  • Frame/Liner: Stainless Steel
  • Weight: 4.49 oz.
  • User: Right Hand, Left Hand
  • Pocket Clip: Tip-Up
  • Knife Type: Spring Assisted
  • Opener: Thumb Stud
  • Lock Type: Bar Lock
  • Brand: Benchmade
  • Model: Boost
  • Model Number: 591BK
  • Country of Origin: USA
  • Best Use: Everyday Carry
  • Product Type: Knife

  • Modified black drop point blade made from CPM-3V.
  • Dual thumb stud openers
  • Black and red polymer handle.
  • Bar lock for secure lock up.
  • Deep carry tip-up pocket clip.


The Benchmade Boost Knife is a fast-action AXIS-Assist knife featuring an integrated safety and a solid ergonomic design. This 591BK model has a black finished CPM-3V premium stainless steel blade with a blunt tip. Its handle is built with red Grivory and black overmolded Versaflex for added strength and increased grip performance. Ambidextrous use is supported with dual thumb studs and a reversible tip-up clip. Give your EDC the ol' Benchmade Boost!

Customer Reviews

Easily my S tier tool
Brandi K. on Nov 25, 2021

To be honest, when I first saw this knife in the case at my local army/navy store I thought it was stupid. Fast forward 6 months and its become an indispensable tool for me. From breaking down wood pallets to ripping staples from target stands it really does it all. I've used it as a screwdriver, hammer, pry bar, and it's wicked sharp to boot! Whenever I encounter a task my first thought has become "Boost?" I'm so glad to own it, and I'm truly sad they discontinued this model. I hope Benchmade releases a new one soon but until then, it's me and my Boost!

tough as nails and sharp as hell!!
Anthony C. on Jul 28, 2020

I love this thing! I thought the blunt tip was gonna be annoying but its taken everything I've put it through so far and does not disappoint. Super sharp edge incredibly tough steel.

Blade HQ Copyright © 2022 Blade HQ. All rights reserved
Give Feedback