Product description
These are "depressed center" aka "type 27" grinding wheels.
They are reinforced with fibre mesh for increased safety
Grinding Wheels 3" x 1/6" x 5/8" ( 75 mm x 4 mm x 16mm )
A60 grit (Aluminum Oxide Abrasive Material)
An excellent wheel both in terms of value and quality
Material: High-performance Alumina Particles