Get more runtime out of your Dereelight DBS or CL1H! 

Only adds about 1.5" in length to your light, but allows for much longer runtimes!

Allows you to use 2 x 18500 or 3 x CR123a batteries with your 3SM pills (including 3SM MC-E, XM-L, and SST-50).  When used with the 1SM-2 pills, you can also use 3 x RCR123 batteries. 

Finished in black HA-III coating.

This extension is for 18500 battery use.   There is also an 18650 extension available here in the accessories section.