2. Holder: The rays in my face when unpacking holds now yet! =) The two parts are solid and tightly interconnected, no wobbling and no rattling. Mounting on the handlebar without tools by hand. Whether this is good or bad (theft), everyone must decide for themselves, I have exchanged hand screw with a hexagon socket. After the first 10km night ride on the mountain bike I am absolutely thrilled, lots of light right where I want it. No slipping, no adjustment, the lamp will not budge. Recommendation !!!