Semroc Plywood Bulkhead or Block for ST-20 tube(2 ring set) SEM-PB-20(ST)
Used as lightweight bulkheads for gluing on the end of a HTC-20 coupler, one ring fits inside the coupler and one on top to match the ID of the tube
Hole for Screw Eye #10(SE-10)
Thickness assembled: 0.25"
Diameter: 2.042" and 2"
Made in the USA