Schluter®-KERDI-DRAIN Tamper Proof Screws are designed as a high security accessory for the KERDI-DRAIN. Ideal for loss prevention and anti-theft, these tamper proof screws are used in environments where tamper resistance is desired or required (e.g., healthcare or education facilities,etc.) Phillips head screws are included with the KERDI-DRAIN. The tamper -proof screws as well as the driver bit must be purchased separately.