The Black Diamond Grease Injector Needle is designed for use with hand-operated grease guns to dispense a fine line of grease in very tight spaces, including universal joints and sealed bearings. It features a grease fitting for quick-connect operation and an 18 gauge x 1-1/2" stainless steel needle for precise delivery, with a protective plastic holder for safe storage. Built for controlled application, it’s rated for a 1,000 psi working pressure.