10.1mm to be exact (according to official specs).
let's not forget the more versatile H1 clip, for up or down carry/clipping. nice carry case which i actually use. and 5 years warranty.
i don't like the PID on the SC32. against a white wall one can see how the ZL light gets dimmer and dimmer every 4sec right after initial activation on Turbo, the PID at work! I prefer constant brightness, heat building up, then big brightness drop, and light can cool off.
i had my share of ZL's. the PID of SC32 really turned me off, i hated it. and i felt bad, the high price didn't feel right for what i got in return, so i had to let it go. looking back i can only think of the negative sides of the SC32 and those 2 reasons why it really had to go. in comparison, thinking of the H1 there is no single point which is negative about my unit. the price is still high imho .. but i had a coupon or whatnot, i ended up paying less than the 55US$ MSRP.
basically i regretted buying the SC32.
and i don't regret having bought the H1. still expensive though!