A complete range of sizes with various hole locations enables the user to purchase a stock base complete with dial indicator mounting collet to make their own dial depth gage using any CDI dial indicator without binding and permits a slight vertical adjustment for positioning. All bases shipped with one mounting collet. Bases are 3/4″ wide by 5/8″ high and are hardened and ground on the contact surface. These dial indicator attachments are readily interchangeable with any other indicator model with AGD standard 3/8″ diameter stem. Bases in combination with a mechanical or digital indicator are used for rapid direct reading measurements of hole depths and recesses.