Specification:

Size: Ring  24-20x7.5
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.