This black granite precision tool room surface plate has an accuracy rating of .0001” and will last for years with almost zero maintenance. Will not burr or nick, this surface plate is harder than steel, and measures 12” x 18” x 3”
Accuracy rating of plus or minus .0001”
Harder than steel
A granite block is handy for layout work, measurement, and for the precision alignment of small assemblies. This particular block is an ideal size for the home shop as it does not require special lifting equipment, and it does not take up a lot of space on your bench. It comes with a certificate of inspection that indicates it is a "B" grade (shop grade) block. A great value at this price. Keep the crate it is shipped in. The top makes an excellent cover to keep your block clean and free from damage when not in use.