Features and advantage of hammer mod: 

1.full detachable, all mechanical switch 

2.no wire solder , no welding

3.pure stainless steel body , high quality

4.fit 18350 , 18500 and 18650 battery , very flexible

5.with switch on the bottom side, easy to press.

6.the hole on bottom of the mod would be used for heat ridiation.

7.the color of the hammer mod can be customized.whole brass or silver can be available.