This item is not currently available.


The Kramer Custom Knives Do Know Harm was created based on the requirements of a currently practicing 18D trained combat and trauma medical doctor. Based off of an 11B scalpel blade and designed primarily as a medical tool, it also excels in defensive as well as EDC applications. The Do Know Harm can be called upon whenever you need precision work to be done. Its thin wharncliff blade with acute point and two sets of jimping allow for unparalleled control. With a full grip the knife pierces and cuts aggressively beyond its relatively small footprint. A textured and contoured G10 handle affords most grip styles for the task at hand. Forward jimping allows control while climbing far forward on the knife for delicate work. The darkened AEB-L steel is able to hold a razor edge with a thin spine. Combined with its tactile G10 slabs, the Do Know Harm has a remarkably thin footprint.

The Kramer Custom Knives Do Know Harm carries securely in its fold over Kydex sheath. Quick to deploy, the sheath has high retention and adjustable carry positions due to the Discreet Carry Concepts Clip. Like every Kramer Custom Knife, the Do Know Harm is guaranteed against breakage. Whether for work or everyday carry, the Do Know Harm adaptability makes it a reliable ally.


  • Compact fixed blade scalpel designed for concealment 

  • Swell at back and front control fore and aft motion of handle which allows for a variety of grip styles

  • A centerline spear point, dark wash AEB-L blade with acute tip for piercing and dual jimped thumb ramp for further leverage and choking up on the blade

  • Fold over style Kydex sheath with a Discreet Carry Mod 4 clip designed for deep IWB carry and immediate access

Behind the Scenes with Kramer Custom Knives

Located in Santee, California, Eric Kramer has been making fixed and folding knives since 2005. Purposely choosing to freehand grind every one of his blades using the stock removal method, each Kramer Custom Knife is certain to be unique. Eric strives to make the very best knives possible and stands behind his product with a guarantee against breakage.

By placing an order with Triple Aught Design, you are verifying that you are over 18 years of age and are aware of all local, state and federal laws regarding the possession of, or the carrying of this product. Triple Aught Design shall be held blameless for any infraction of laws made by the purchaser.




Blade: AEB-L

Handle / Scales: Textured  Black G10

Sheath: Kydex w Discreet Carry Concepts Mod 4 Clip


Overall Length: 7.25” (18.41 cm)

Blade Length: 3.5” (8.89 cm)

Handle Length: 3.75” (9.52cm) 

Width of Handle: .374” (.951 cm)

Width of Spine: .115”  (.292 cm)


W O Sheath :  3.83 oz

W Sheath : 5.90 oz


AEB-L Blade with Dark Stone Wash Finish

Sure Touch Texture Black G10

Fold Over Kydex w Discreet Carry Concepts Mod 4 Clip

Labels & Logos  

Laser Etched Triple Aught Design & Kramer Custom Knives Logos

Made in The USA