His dropins are mde for fit SurFire and Mag-Lights. I have two of his M60 dropins. One is in a SureFire Centurion C2 and The other is in one of Malkoff's own hosts...the HA III MD2 model. Last week, Malkoff introduced a bezel that will allow an E series SureFire to use his M60 series dropins. I've never had a SureFire LED so I can't really compare the Malkoff lamps to SureFire's but, from what I've read, Malkoff's are superior.
The M60 series dropins can be had in various formats featuring flood or throw or a combination of the two. He also offers low and low low output lamps.
Here's a few pics:
My MD2 with the M60 dropin:

The Malkoff and my C2:

The threads:

Bill