A Pack Of 50 Groz-Beckert® 7X3 DYX3 Industrial Sewing Machine Needles. 

For Singer 7 Class, 34 Class, 144 Class machines and other extra heavy sewing industrial machines including : Tippmann Boss, Tippmann Aerostitch, Adler 205-370, 205-374, 204-370, 204-374, Juki Pro 2000, Ferdinand Bull Artisan Toro 4000.

Needle system* : 7X3

Also sold under needle system number's : 794H, DYX3, SY5213

Needle Length, butt to needle eye : 60.0mm

Shank Diameter : 2.5mm

*A needle system is a group of needles made to fit specific sewing machines. All needles in a system are of the same length and shank size, but are of various diameters. Lower size numbers are narrower or thinner needles used for lighter materials. Higher size numbers indicate a needle of thicker diameter, used for heavier materials. Match your needle system to your machine, then the size of the needle to the product you are sewing.