Working pull from a low-use residential system.  Comes from a smoke-free, pet-free environment.  A few of them have broken tabs as shown in the picture, but would still tighten.

Here's the specs from the Earthquake website:

Frequency Response: 45 Hz - 20 kHz

Specifications

• 1-inch silk dome swivel NEO tweeter

• Bumped back basket for high speaker excursion

• Wider surround for deeper bass and higher speaker excursion

• 12 dB/Octave filter network crossover

• Thermal tweeter protection

• Custom compact spring loaded terminals

• Easy to use Turn ‘N’ Lock installation mechanism

• 20% trimmer speaker frame for to reduce visibility

• Paintable rust-resistant grille

• Overall diameter: 8" (203mm)

• Cut out diameter: 7" (177mm)

• Mounting depth: 3" (77mm)