Frame Material: aluminum alloy Shaft Size: 4mm to 5mm Shaft Length: 50mm Feature: The 90 degree right angle implements right angle turns and corner steering mechanisms in various equipment setups Usage: It enables smooth rotation and torque transfer between components for seamless functionality and is suitable for simple DIY mechanical applications 1. The product needs to be assembled by yourself. 2. The diameter of the shaft is 4mm to 5mm, the material bearing steel, the length is 50mm. 3. The frame material is aluminum alloy, sandblasted oxidized bright silver treatment, very beautiful, size lining. Color: Silver Material: Metal Package Contents: 1pcs * bevel gear 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.