What is this device and its purpose?

• A. Rehandling clamshell
• B. Self-dumping bin
• C. Pile hammer
• D. Grapple

Answer: (A)

A crane-mounted clamshell bucket used for rehandling bulk materials. This device has two hinged shells that open and close to grab loose material from a stockpile, a yard, or a vessel, and then lift and relocate it to another location or into a bin, truck, or hopper. The term “rehandling” highlights its job of moving material that’s already on site rather than loading material from a source like a mine or ship.

Other options describe different equipment: a self-dumping bin is a container that dumps its contents when tipped, not a crane grab used for transferring bulk material; a pile hammer is used to drive piles into the ground; a grapple is a claw-like implement for grabbing irregular objects such as logs or scrap metal. The rehandling clamshell is the best fit because its purpose centers on efficiently grabbing and moving bulk material with a crane.