These bits are made of the world's finest 18-8 (chromium/nickel) stainless steel. This alloy is best for bits because it extremely strong and resists salt and acids in saliva, and will never rust or spot.

The Kimberwick part is 4" high and 2 1/2" across
The mouth at the thickest is 1/2inch(14mm) - the mouth edge is 12mm