[ 316 Stainless Steel]: Constructed - investment cast 316 stainless steel. In humid air or high-temperature weather, compared with 304 stainless steel or iron material, 316 stainless steel has stronger anti-rust, abrasion resistance. [Easy for installation]:This ratchet rail antenna base features a lever-action lay-down handle that makes lowering the antenna quick and easy. Lever action laydown handle makes lowering antenna quick and easy for passing under bridges, storage, and trailering. Fits all standard 7/8 inch (22mm) or 1 inch (25mm) marine antennas. makes it easy to return the antenna to its correct, upright position. [EXQUISITE DESIGN]This VHF marine antenna rail mount has a lever-action drop handle, which can quickly and easily lower the antenna, leverage makes lowering the antenna quick and easy for passing bridges, storage and trailers, duty marine antenna mount has two adjustable ratchets. Material: Stainless steel colour: silver Package Contents: 2 x Antenna Mount Rail (Different batches, different mold product numbers, and different appearances not affect the use of the product) 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.