1" Everwear Bit Guard for The Grinder Specially Designed For Use With THE GRINDER® The EverWear Bit Guard fits snuggly into the opening on The GRINDER Grid. Unlike plastic guards, the EverWear Bit Guard’s robust stainless steel composition will not scratch glass. The two sizes allow use for intricate and grander glass pieces. Features: Made of Durable Stainless Steel Does Not Corrode or Rust Prevents Scratching of Glass Interchangeable Sizes of 3/4" and 1" for Intricate and Standard Grinding