for Lenses: Specifically designed for EF100-400mm F4.5-5.6L IS II, this tripod mount ring replaces the original seat, ensuring a and enhanced stability. Construction: Crafted from premium materials, this replacement mount is built to withstand rigorous use, making it ideal for professional photography. Enhanced Stability: Provides solid support and stability for your lens, reducing shake and enabling precise framing and images. Specifications: Material:aluminum alloy The UNC (Unified National Coarse Thread) is 1/4" Color: Silver Package Contents: 1 * Tripod ring replacement seat 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.