What is a Lishi Tool?

A Lishi tool is a precision locksmith instrument used to pick and decode pin tumbler and wafer locks in a single motion, most commonly on automotive door locks and ignitions. Unlike traditional lock picks, a Lishi tool combines picking and reading capabilities in one device, allowing a locksmith to open the lock and identify the key's bitting (cut depths) at the same time. Lishi tools are named after their manufacturer and are widely regarded as an essential upgrade for professional automotive locksmiths.

Main Characteristics of a Lishi Tool

• Vehicle-specific and keyway-specific design — each Lishi tool is manufactured to match a particular lock or keyway (e.g., HU100, SIP22, HU66)

• Built-in decoder window or dial that displays pin depths as the tool moves through the lock

• Compact, ergonomic handle designed for fine control and tactile feedback

• Durable stainless steel construction to withstand repeated automotive and commercial use

• Available in 2-in-1 (pick and decode) or standalone decoder-only versions

How to Use a Lishi Tool

1. Select the Lishi tool that matches the vehicle's keyway

2. Insert the tool into the lock cylinder in place of a key

3. Apply light tension while gently manipulating the tool to feel each pin

4. Lift each pin to the shear line one at a time, using feedback from the tool

5. Read the corresponding bitting numbers from the decoder as each pin sets

6. Once all pins are set, turn the plug to open the lock

How Does a Lishi Tool Work?

A Lishi tool works by combining the function of a pick and a caliper inside one keyway-shaped blade. As the tool is inserted, its shaped tip contacts each pin stack in the lock. The locksmith manipulates the tool to lift each pin individually while applying tension to the plug, similar to traditional single-pin-picking. As each pin reaches the correct height, the tool's built-in gauge displays the depth of that cut. Once every pin is set at the shear line, the plug rotates freely and the lock opens — with the added benefit of a full key code read.

Types of Lishi Tools

• 2-in-1 Lishi tools — pick and decode simultaneously, used for both opening and key origination

• Decoder-only Lishi tools — used purely to read pin depths without picking the lock

• Ignition Lishi tools — designed specifically for vehicle ignition cylinders rather than door locks

• HU-series and SIP-series tools — keyway-specific variants covering different vehicle makes and lock families

• Residential and padlock Lishi tools — adapted versions for non-automotive pin tumbler locks

What Are Lishi Tools Used For?

Lishi tools are used primarily in automotive locksmithing to open vehicle door locks and ignitions without the original key, and to decode the key's bitting so a working key can be cut on the spot. They are also used for lockouts, key origination when no key exists, and diagnostic work where a locksmith needs to confirm a lock's cut depths before ordering parts or programming a transponder key.

Advantages of Lishi Tools

• Combines picking and decoding into a single fast process

• Reduces the need for destructive entry on vehicle locks

• Allows locksmiths to originate a working key without an existing key

• Keyway-specific design improves speed and reduces lock damage

• Reusable across many jobs, making it cost-effective for high-volume automotive locksmiths

• Provides tactile and visual feedback, making pin manipulation more precise than standard picks