Features MAIN FUNCTION: These collars are mainly used for shaft fixation and locating, linear motion stopper and drill bit fixation, simple and practical. EASY ADJUSTMENT: The shaft can be clamped by adjusting screws, ensuring safe and reliable operation without damaging the shaft. ALUMINUM ALLOY: These collars are made of excellent aluminum alloy, corrosion and oxidation resistant, lightweight and durable. STANDARD SIZE: These shaft collars are open type with 12mm bore, easy to install, clamp, and adjust without large scale disassembly. WIDE APPLICATION: Suitable for gear box assembly, motor base, machine tool, transmission shaft, steel plant, automotive industry, etc. Specification: Item Type: Shaft Collar Bore: Approx. 12mm / 0.47in Material: Aluminum Alloy Application: Used for fixing and locating shafts, linear motion stoppers, and fixing drill bits. Suitable for gear box assembly, motor base, machine tool, transmission shaft, agricultural implement, medical equipment, paper and steel plant equipment, automotive industry, industrial, amateur craft industries, etc. Package List:10 x Shaft Collars 10 x Screws Package List 10 x Shaft Collars 10 x Screws