UBER GULAG SHIM 3.0 The Uber Gulag Shim 3.0 is a combination of the original Uber Shim and Gulag Shim. Developed by Karl OscarDelta and precision engineered in the UK the unique length, width and thickness ensures it will work with a wider selection of handcuffs that would otherwise resist or fail to shim with other commercially available shims. These include American UZI, British TCH, Czech ALFAproj, Polish KEL-MET, Russian BRS-2, Russian CROT and Spanish ALYCON. When using the Uber Gulag Shim the silky smooth operation almost makes shimming effortless! In additional to its unique design features the Uber Gulag Shim is 304 Full Hard Stainless Steel that differs from other forms of 304 in that it has been hard cold rolled to its full hard condition. This increases its fatigue life. In its full hard condition, type 304 stainless steel has a tensile strength of 185,000 PSI minimum, and a minimum yield strength of 140,000 PSI. So unlike spring steel the Uber Shim will not easily snap when bent so it is possible to reshape and straighten. - Stainless Steel - Rust Resistant - Silent Operation. Tip: Do not force the shim as you will bend it! Always start shimming where the ratchet arm enters, there should be a small gap, insert the tip of the shim and at the same time slightly push in the ratchet arm to assist (push assist). Only do this if the shim is moving between the ratchet and pawls (teeth) otherwise you risk over-tightening the handcuffs. In the event that shimming does not work it is possible that the handcuffs are either double-locked or have security features to prevent shimming. AHK3 and R Clip NOT included. Not all shims are created equal... - Various shims vs Uzi handcuffs (YouTube video). - Various shims vs Russin BRS-2 handcuffs (YouTube video).