cheap and effective,
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This review is from: Bicycle Bike Cycle Led Light (Sports)
The clamps that attach them to your bike include rubber lining so that they dont scratch, they're a simple "tighten and then screw in place" design, they've stayed on my bike for 5 months now, loose enough for me to move up and down (front, rear should be locked in place) by hand but stiff enough not to adjust themselves everytime I jump a curb. I've been light mountain biking and done above 100 miles of road and curbs with these lights. The front light is good enough so that it lights up pitch black areas if you're going slow and have it angled right with good battery power, the rear is the one you'll use most often and is visible from quite a distance with several modes, the solid on and the flashing are your go to during the winter, night and rain.
taking the lights on and off is easy as pie too as they click straight in and out.
I'd say the only downside is the fact it uses AA's and AAA's(included), I prefer newer higher voltage batteries. For the price I've had a good run with them.