Specification:

Size: Ring 24-20x7.5 N35
Outer Dia: 24 mm
Inner Dia: 20 mm
Thickness: 7.5 mm 
Grade: N35
Coating: Nickle - Ni  
Max Operating Temperature: 80°C  

Description:
Nickel Coated Magnets have many industrial, educational and household uses. These Magnets are highly resistant against demagnetization.