Model: M8 x 1 thread. Made of brass metal material, anti-corrosion and durable. The grease nipple mouth is flat and smooth, great for fastening. The thread is deeply, thread pitch more sturdy, it will not slippery when rotating. One sprung ball check prevents entrance of dirt. No leakage, convenience to replace, versatility. Suitable for most automotive, motorcycle, truck, car, and industrial applications. Note: Please check the size and make sure this is the correct part for your unit. Package Include: 24 x Grease Nipples