Semroc Plywood Bulkhead or Block for BT-70 tube(2 ring set) SEM-PB-70
Used as lightweight bulkheads for gluing on the end of a JT-70 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: 2.175" and 2.218"
Made in the USA