MADE IN USA. This is the extended and tapered copper heat sink that is included with the Survival Laser 1.4, II, and IISE parts bundles using the stainless steel host assembly option, and the unmarked stainless steel host assembly (P/N SL-SS2LHA). Overall length is 1.24', weight is 58 grams. The SL-CHS3 is sized to fit a 12mm diameter standard diode module and includes a 3-48 set screw (installed) and a 0.050' Allen wrench. Also fits other Aurora C6 18650 hosts.