This is a 17.5" circle mold that requires NO caulking! The base is made from 3/4" HDPE and the wall it 1/8" HDPE.
 
Includes:
17 3/8" temple made from 1/2" HDPE
Leveling feet
Leveling bubble
Bolts and Big Red Knob
3 Hold down bars
6 Spacers