Fixed hood can be recessed under CR2 cork ring. Overall length 90mm (3.544") with aluminum cap. Dynawood insert I.D. of 11.5mm (0.453") accepts the reamable GA12 arbor. Anodized aluminum. Unassembled. Use with A5CAP end cap, BP16 rubber plug, or fighting butts F2M, F2 and F5. *Note item is shown with Walnut Dynawood insert.