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The Glass Grinder is a trap from the Saw franchise appearing in Spiral.

Design and Function

This trap consists of a large scrap shredder with two chutes cut out in the front and a set of fans at the back, with a conveyor to deliver bottles to the shredder. The victim has their hands restrained above their body with their back facing the chutes. When trap begins, many glass bottles are delivered via the conveyor belt into the shredder at regular intervals. Once the shards are small enough, they slip through the grinder into an area below the machine, where a set of fans blow the shards to the other side. The chutes in front of the shredder allows the glass shards to deflect out at high speeds, shredding the main test subject from the back, where they would quickly die of blood loss.

The second test subject has to find the key in a trashcan using the hint in the tape ("...locked up, and thrown away the key"), and unlock the padlock in the victim, when the conveyor, shredder and fans finally stop. The second test subject is then given 20 seconds to find and use the key to free the first subject, escaping the trap. If they do not do this, the first subject dies of blood loss. (Spiral)

History

Hello, Detective Banks. When Peter Dunleavy murdered an innocent man, your career shattered like glass. Can you stand on the sidelines while justice is finally served? There is a way to save him, or you can keep him locked up and throw away the key. The decision is yours.
— Peter Dunleavy's Tape[src]

The trap was designed and built by William Emmerson, a homicide detective who targeted corrupt members of the Metropolitan Police Department to avenge his father, Charlie Emmerson, who was unfairly killed by Peter Dunleavy.

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