Semroc Plywood Bulkhead or Block for BT-5 tube(2 ring set)(same RA-5P) SEM-PB-5P
Used as lightweight bulkheads for gluing on the end of a HTC-5 and JT-5 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: 0.541" and 0.515"
Made in the USA