Lab universal clamps manufactured in China

What kind of universal clamps are used in chemical experiments? – Generally  used the following : 2-plated, three pongs and four pongs clamps, which can fix the vial, flask, dropper, condenser, etc.

Lab universal clamps manufactured in China-মাস্টারলি, চীন কারখানা, সরবরাহকারী, উত্পাদনকারী