Inland's sintered diamond laps are professional faceting laps and the longest lasting laps on the market today. These laps have a 3.5mm deep, diamond matrix that continuously exposes diamond cut after cut. Sintered products can be dressed to expose additional crystals for a more aggressive cut. These laps are directional. Choose your dressing; CCW rotation (counter-clockwise) or CW rotation (clockwise). Laps have 1/2" arbor.