Magnetisation Grade:         N38
Material: Neodymium-Iron-Boron (NdFeB), Neodymium and Steel 
Magnet ID:              NPC-75-N38-Zn
Plating / Coating: Zinc / Zn    
Shape: Ring / with Countersunk (Countersink)   
Pot Magnet Size: 
Pot Total Diameter (D):        75 mm
Pot Total Height (H):         18 mm
Borehole Top (d1):        10.5 mm
Borehole Bottom (d2):         18 mm
Countersunk Depth (h):         10.6 mm
Tolerance:         ±0.1 mm
Magnetisation Direction:   Axial      
Residual Magnetic Flux Density (Br): 12.2-12.6 KGs (T):  1.22-1.26 T 
Energy Density (BH)max:              35-39 MGOe   279-310 KJ/m³   
Coercivity Force (Hcb):              ≥10.8 KOe  ≥860 KA/m   
Intrinsic Coercivity Force (Hcj):    ≥12 KOe    ≥955 KA/m   
Maximum Operation Temperature: 80 °C 
Delivery Time:           14-35 days   
Measurements:

These magnets have a countersunk central hole on the front (magnetic) face of the magnet.
Neodymium Pot Magnet. The NORTH pole is on the centre of the front face and the SOUTH is on the outer edge around it (both poles are on the same face). These Magnets are plated with 3 layers of protective coatings -zinc.
What is pot magnets?
Pot magnets are made up of magnets (NdFeB, SmCo, AlNiCo or Hard Ferrite) and other spare parts, such as metal, plastic, rubber and other components. Sometimes Pot magnets can meet some special requirements while a single magnet can not do. In the meantime, using pot magnets can save more cost than just using magnets and gain the same purpose.