After using this part, the opening of the head cover can be prevented from cracking, and the fiberglass head cover can be easily removed and put on Most helicopter hoods are fixed with rubber gaskets. As rubber gaskets pass through the casing, they deteriorate and break over time. This metal shell holder is equipped with a screw thread on both sides for locking and a rubber O-ring to protect the casing from damage. The yellow rubber ring fixed on the aluminum column of the body is made of silicone material, which is wear-, has a long service life, and is also easier to disassemble and assemble. After using this part, it is easy to put on and the 450/500/600/700 fiberglass hood. Prevent cracking at the opening, suitable for 450/500/600/700 models. Color: Silver Material: Metal Package Contents: 3Pair Alloy Grommet for Heli Canopy Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.