Features: The shaft collar is a simple, yet important machine component found in many power transmission applications, such as motors and gearboxes. The shaft collars are used as mechanical stops, locating components, and bearing faces. The simple design lends itself to easy installation. Set screw shaft collars are the most effective when used on a shaft made of a material which is softer than the set screw. Perfect for greater torque capacity and improved holding power. Specifications: Material: Metal Inner dia.: 10mm / 0.4inch Outer dia.: 17mm / 0.7inch Thickness: 8mm / 0.3inch Weight: 22g Package Included: 2 x Shaft Collar 1 x Hex Wrench Note: Due to the light and screen difference, the item's color may be slightly different from the pictures. Please allow differences due to manual measurement. 1、The shaft collar is a simple, yet important machine component found in many power transmission applications, such as motors and gearboxes 2、The shaft collars are used as mechanical stops, locating components, and bearing faces 3、The simple design lends itself to easy installation 4、Set screw shaft collars are the most effective when used on a shaft made of a material which is softer than the set screw 5、Perfect for greater torque capacity and improved holding power