This is an embeddable sensor with a 1.5mm working distance.      
 * Barrel and nut stainless steel 8mm      
 * Output 3 wire DC NPN (current sinking) normally open      
 * Voltage 10-30 vdc      
 * LED on Output energized      
 * LED blinking Short circuit warning      
 * with M8 Picofast quick disconnect      
Sensor is used - tested - with 60 day Warranty.      
For cable requirements see:      
http://www.kkdepot.com/category.asp?cat=38      
Price $29.00 ea. (6 available)