24121 Grabber Claw
This Lego grabber/ gripper/ claw uses yellow 24121 "Technic, Gear Rack 11 x 11 Curved" parts. The gear teeth on the parts, and the curved shape, makes it good for grasping round objects (such as balls, cans and bottles). The black 6628 "Technic, Pin with Friction Ridges Lengthwise and Towball" parts, stuck onto pairs of 4185 "Technic Wedge Belt Wheel (Pulley)" parts, create meshing "Dog Gears" that open and close the claw. Although an EV3 Medium Motor is used to control movement, one could substitute a Lego Power Functions Large Motor instead. The gripper could be useful for FIRST Lego League (FLL) and World Robotics Competition (WRO) events.
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