Feature: 1. PREMIUM MATERIAL: Stainless steel trolley roller wheels are made of excellent metal material, sturdy and long lasting, galvanized surface, rust and erosion resistant 2. HIGH STABILITY: The sealing ring between the M10 bolts head and the rubber can keep the bolts and rubber from being pushed and crushed under the action of lateral forces, while also limiting the roller wheel impact resistance. Greatly improved trolley roller limit stability and reduce vibration 3. WIDE APPLICATION: Strut channel roller wheels is applicable to all channels with 1‑5/8in wide channels and all 1‑5/8in wide channels or higher strut channels to prevent hand trolley parts rushed out of the end of the cylinder channel 4. EASY INSTALLATION: The trolley wheel limiter is easy to use and install. Use M10 bolts to lock, only need to tighten the hex nut, lockable by strut channel, easy to install, convenient 5. STABLE OPERATING: The limit roller wheel has beautiful form, fluent design, solid rigidity, noiseless and wear resistant, manufactured with high accuracy technology, you can operate. Easy to operate, good coordination and no noise Specification: Item Type: Stainless Steel Trolley Roller Wheels Material: Rubber and stainless steel. Package List: 2 Set of Rubber Stop Pulleys